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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Rarity%2C+J&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Rarity%2C+J&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Rarity%2C+J&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Rarity%2C+J&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.16835">arXiv:2408.16835</a> <span> [<a href="https://arxiv.org/pdf/2408.16835">pdf</a>, <a href="https://arxiv.org/format/2408.16835">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Physical Security of Chip-Based Quantum Key Distribution Devices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=J%C3%B6hlinger%2C+F">Friederike J枚hlinger</a>, <a href="/search/quant-ph?searchtype=author&query=Semenenko%2C+H">Henry Semenenko</a>, <a href="/search/quant-ph?searchtype=author&query=Sibson%2C+P">Philip Sibson</a>, <a href="/search/quant-ph?searchtype=author&query=Aktas%2C+D">Djeylan Aktas</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Erven%2C+C">Chris Erven</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S">Siddarth Joshi</a>, <a href="/search/quant-ph?searchtype=author&query=Faruque%2C+I">Imad Faruque</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.16835v1-abstract-short" style="display: inline;"> The security proofs of the Quantum Key Distribution (QKD) protocols make certain assumptions about the operations of physical systems. Thus, appropriate modelling of devices to ensure that their operations are consistent with the models assumed in the security proof is imperative. In this paper, we explore the Trojan horse attack (THA) using Measurement Device Independent (MDI) QKD integrated phot… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.16835v1-abstract-full').style.display = 'inline'; document.getElementById('2408.16835v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.16835v1-abstract-full" style="display: none;"> The security proofs of the Quantum Key Distribution (QKD) protocols make certain assumptions about the operations of physical systems. Thus, appropriate modelling of devices to ensure that their operations are consistent with the models assumed in the security proof is imperative. In this paper, we explore the Trojan horse attack (THA) using Measurement Device Independent (MDI) QKD integrated photonic chips and how to avoid some of the security vulnerabilities using only on-chip components. We show that a monitor photodiode paired appropriately with enough optical isolation, given the sensitivity of the photodiode, can detect high power sniffing attacks. We also show that the placement of amplitude modulators with respect to back reflecting components and their switching time can be used to thwart a THA. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.16835v1-abstract-full').style.display = 'none'; document.getElementById('2408.16835v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 12 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.04075">arXiv:2404.04075</a> <span> [<a href="https://arxiv.org/pdf/2404.04075">pdf</a>, <a href="https://arxiv.org/format/2404.04075">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Crosstalk-mitigated microelectronic control for optically-active spins </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Weng%2C+H">Hao-Cheng Weng</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Balram%2C+K+C">Krishna C. Balram</a>, <a href="/search/quant-ph?searchtype=author&query=Smith%2C+J+A">Joe A. Smith</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.04075v1-abstract-short" style="display: inline;"> To exploit the sub-nanometre dimensions of qubits for large-scale quantum information processing, corresponding control architectures require both energy and space efficiency, with the on-chip footprint of unit-cell electronics ideally micron-scale. However, the spin coherence of qubits in close packing is severely deteriorated by microwave crosstalk from neighbouring control sites. Here, we prese… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.04075v1-abstract-full').style.display = 'inline'; document.getElementById('2404.04075v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.04075v1-abstract-full" style="display: none;"> To exploit the sub-nanometre dimensions of qubits for large-scale quantum information processing, corresponding control architectures require both energy and space efficiency, with the on-chip footprint of unit-cell electronics ideally micron-scale. However, the spin coherence of qubits in close packing is severely deteriorated by microwave crosstalk from neighbouring control sites. Here, we present a crosstalk-mitigation scheme using foundry microelectronics, to address solid-state spins at sub-100 um spacing without the need for qubit-detuning. Using nitrogen-vacancy centres in nanodiamonds as qubit prototypes, we first demonstrate 10 MHz Rabi oscillation at milliwatts of microwave power. Implementing the active cancellation, we then prove that the crosstalk field from neighbouring lattice sites can be reduced to undetectable levels. We finally extend the scheme to show increased qubit control, tripling the spin coherence under crosstalk mitigation. Compatible with integrated optics, our results present a step towards scalable control across quantum platforms using silicon microelectronics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.04075v1-abstract-full').style.display = 'none'; document.getElementById('2404.04075v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.02002">arXiv:2312.02002</a> <span> [<a href="https://arxiv.org/pdf/2312.02002">pdf</a>, <a href="https://arxiv.org/format/2312.02002">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> End-to-End Demonstration for CubeSatellite Quantum Key Distribution </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+P">Peide Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Sagar%2C+J">Jaya Sagar</a>, <a href="/search/quant-ph?searchtype=author&query=Hastings%2C+E">Elliott Hastings</a>, <a href="/search/quant-ph?searchtype=author&query=Stefko%2C+M">Milan Stefko</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S">Siddarth Joshi</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.02002v2-abstract-short" style="display: inline;"> Quantum key distribution (QKD) provides a method of ensuring security using the laws of physics, avoiding the risks inherent in cryptosystems protected by computational complexity. Here we investigate the feasibility of satellite-based quantum key exchange using low-cost compact nano-satellites. This paper demonstrates the first prototype of system level quantum key distribution aimed at the Cube… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.02002v2-abstract-full').style.display = 'inline'; document.getElementById('2312.02002v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.02002v2-abstract-full" style="display: none;"> Quantum key distribution (QKD) provides a method of ensuring security using the laws of physics, avoiding the risks inherent in cryptosystems protected by computational complexity. Here we investigate the feasibility of satellite-based quantum key exchange using low-cost compact nano-satellites. This paper demonstrates the first prototype of system level quantum key distribution aimed at the Cube satellite scenario. It consists of a transmitter payload, a ground receiver and simulated free space channel to verify the timing and synchronisation (T&S) scheme designed for QKD and the required high loss tolerance of both QKD and T&S channels. The transmitter is designed to be deployed on various up-coming nano-satellite missions in the UK and internationally. The effects of channel loss, background noise, gate width and mean photon number on the secure key rate (SKR) and quantum bit error rate (QBER) are discussed. We also analyse the source of QBER and establish the relationship between effective signal noise ratio (ESNR) and noise level, signal strength, gating window and other parameters as a reference for SKR optimization. The experiment shows that it can tolerate the 40 dB loss expected in space to ground QKD and with small adjustment decoy states can be achieved. The discussion offers valuable insight not only for the design and optimization of miniature low-cost satellite-based QKD systems but also any other short or long range free space QKD on the ground or in the air. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.02002v2-abstract-full').style.display = 'none'; document.getElementById('2312.02002v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.07599">arXiv:2309.07599</a> <span> [<a href="https://arxiv.org/pdf/2309.07599">pdf</a>, <a href="https://arxiv.org/ps/2309.07599">ps</a>, <a href="https://arxiv.org/format/2309.07599">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="History and Philosophy of Physics">physics.hist-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevResearch.5.048002">10.1103/PhysRevResearch.5.048002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Reply to "Comment on `Weak values and the past of a quantum particle' '' </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J+R">Jonte R Hance</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Ladyman%2C+J">James Ladyman</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.07599v2-abstract-short" style="display: inline;"> We here reply to a recent comment by Vaidman [\href{https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.5.048001}{Phys. Rev. Res. 5, 048001 (2023)}] on our paper [\href{https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.5.023048}{Phys. Rev. Res. 5, 023048 (2023)}]. In his Comment, Vaidman first admits that he is just defining (assuming) the weak trace gives the p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07599v2-abstract-full').style.display = 'inline'; document.getElementById('2309.07599v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.07599v2-abstract-full" style="display: none;"> We here reply to a recent comment by Vaidman [\href{https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.5.048001}{Phys. Rev. Res. 5, 048001 (2023)}] on our paper [\href{https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.5.023048}{Phys. Rev. Res. 5, 023048 (2023)}]. In his Comment, Vaidman first admits that he is just defining (assuming) the weak trace gives the presence of a particle -- however, in this case, he should use a term other than presence, as this already has a separate, intuitive meaning other than ``where a weak trace is''. Despite this admission, Vaidman then goes on to argue for this definition by appeal to ideas around an objectively-existing idea of presence. We show these appeals rely on their own conclusion -- that there is always a matter of fact about the location of a quantum particle. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07599v2-abstract-full').style.display = 'none'; document.getElementById('2309.07599v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">2 pages, no figures, matches published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Research 5, 048002 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.08439">arXiv:2306.08439</a> <span> [<a href="https://arxiv.org/pdf/2306.08439">pdf</a>, <a href="https://arxiv.org/format/2306.08439">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Coherent scattering from coupled two level systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Nutz%2C+T">Thomas Nutz</a>, <a href="/search/quant-ph?searchtype=author&query=Mister%2C+S+T">Samuel T. Mister</a>, <a href="/search/quant-ph?searchtype=author&query=Androvitsaneas%2C+P">Petros Androvitsaneas</a>, <a href="/search/quant-ph?searchtype=author&query=Young%2C+A">Andrew Young</a>, <a href="/search/quant-ph?searchtype=author&query=Harbord%2C+E">E. Harbord</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">J. G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Oulton%2C+R">Ruth Oulton</a>, <a href="/search/quant-ph?searchtype=author&query=McCutcheon%2C+D+P+S">Dara P. S. McCutcheon</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.08439v1-abstract-short" style="display: inline;"> We study the resonance fluorescence properties of an optically active spin 1/2 system, elucidating the effects of a magnetic field on the coherence of the scattered light. We derive a master equation model for this system that reproduces the results of a two level system (TLS) while also being applicable to a spin system with ground state coupling. This model is then solved analytically in the wea… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.08439v1-abstract-full').style.display = 'inline'; document.getElementById('2306.08439v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.08439v1-abstract-full" style="display: none;"> We study the resonance fluorescence properties of an optically active spin 1/2 system, elucidating the effects of a magnetic field on the coherence of the scattered light. We derive a master equation model for this system that reproduces the results of a two level system (TLS) while also being applicable to a spin system with ground state coupling. This model is then solved analytically in the weak excitation regime. The inclusion of spin dynamics in our model alters the properties of the coherently scattered light at a fundamental level. For a TLS the coherence properties are known to be determined by the input laser. We show that spin scattered light inherits the coherence properties of the spin. This mapping allows us to measure spin dynamics and coherence time through direct measurement of the scattered fields. Furthermore, we show the ability to resolve sub-natural linewidth zeeman splittings. Along with representing an invaluable tool for spin spectroscopy understanding the coherence properties of the spin-scattered field will be vital for spin-photon based quantum technologies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.08439v1-abstract-full').style.display = 'none'; document.getElementById('2306.08439v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.10227">arXiv:2304.10227</a> <span> [<a href="https://arxiv.org/pdf/2304.10227">pdf</a>, <a href="https://arxiv.org/format/2304.10227">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/acsphotonics.3c00713">10.1021/acsphotonics.3c00713 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Heterogeneous integration of solid state quantum systems with a foundry photonics platform </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Weng%2C+H">Hao-Cheng Weng</a>, <a href="/search/quant-ph?searchtype=author&query=Monroy-Ruz%2C+J">Jorge Monroy-Ruz</a>, <a href="/search/quant-ph?searchtype=author&query=Matthews%2C+J+C+F">Jonathan C. F. Matthews</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Balram%2C+K+C">Krishna C. Balram</a>, <a href="/search/quant-ph?searchtype=author&query=Smith%2C+J+A">Joe A. Smith</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2304.10227v1-abstract-short" style="display: inline;"> Diamond colour centres are promising optically-addressable solid state spins that can be matter-qubits, mediate deterministic interaction between photons and act as single photon emitters. Useful quantum computers will comprise millions of logical qubits. To become useful in constructing quantum computers, spin-photon interfaces must therefore become scalable and be compatible with mass-manufactur… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.10227v1-abstract-full').style.display = 'inline'; document.getElementById('2304.10227v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.10227v1-abstract-full" style="display: none;"> Diamond colour centres are promising optically-addressable solid state spins that can be matter-qubits, mediate deterministic interaction between photons and act as single photon emitters. Useful quantum computers will comprise millions of logical qubits. To become useful in constructing quantum computers, spin-photon interfaces must therefore become scalable and be compatible with mass-manufacturable photonics and electronics. Here we demonstrate heterogeneous integration of NV centres in nanodiamond with low-fluorescence silicon nitride photonics from a standard 180 nm CMOS foundry process. Nanodiamonds are positioned over pre-defined sites in a regular array on a waveguide, in a single post-processing step. Using an array of optical fibres, we excite NV centres selectively from an array of six integrated nanodiamond sites, and collect the photoluminescence (PL) in each case into waveguide circuitry on-chip. We verify single photon emission by an on-chip Hanbury Brown and Twiss cross-correlation measurement, which is a key characterisation experiment otherwise typically performed routinely with discrete optics. Our work opens up a simple and effective route to simultaneously address large arrays of individual optically-active spins at scale, without requiring discrete bulk optical setups. This is enabled by the heterogeneous integration of NV centre nanodiamonds with CMOS photonics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.10227v1-abstract-full').style.display = 'none'; document.getElementById('2304.10227v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 4 figures, and supplementary material</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> ACS Photonics 2023, 10, 9, 3302-3309 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.17258">arXiv:2303.17258</a> <span> [<a href="https://arxiv.org/pdf/2303.17258">pdf</a>, <a href="https://arxiv.org/format/2303.17258">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Integrate and scale: A source of spectrally separable photon pairs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Burridge%2C+B+M">Ben M. Burridge</a>, <a href="/search/quant-ph?searchtype=author&query=Faruque%2C+I+I">Imad I. Faruque</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Barreto%2C+J">Jorge Barreto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.17258v1-abstract-short" style="display: inline;"> Integrated photonics is a powerful contender in the race for a fault-tolerant quantum computer, claiming to be a platform capable of scaling to the necessary number of qubits. This necessitates the use of high-quality quantum states, which we create here using an all-around high-performing photon source on an integrated photonics platform. We use a photonic molecule architecture and broadband dire… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.17258v1-abstract-full').style.display = 'inline'; document.getElementById('2303.17258v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.17258v1-abstract-full" style="display: none;"> Integrated photonics is a powerful contender in the race for a fault-tolerant quantum computer, claiming to be a platform capable of scaling to the necessary number of qubits. This necessitates the use of high-quality quantum states, which we create here using an all-around high-performing photon source on an integrated photonics platform. We use a photonic molecule architecture and broadband directional couplers to protect against fabrication tolerances and ensure reliable operation. As a result, we simultaneously measure a spectral purity of $99.1 \pm 0.1$ %, a pair generation rate of $4.4 \pm 0.1$ MHz mW$^{-2}$, and an intrinsic source heralding efficiency of $94.0 \pm 2.9$ %. We also see a maximum coincidence-to-accidental ratio of $1644 \pm 263$. We claim over an order of magnitude improvement in the trivariate trade-off between source heralding efficiency, purity and brightness. Future implementations of the source could achieve in excess of $99$ % purity and heralding efficiency using state-of-the-art propagation losses. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.17258v1-abstract-full').style.display = 'none'; document.getElementById('2303.17258v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 4 figures (main text), 11 pages 14 figures (supplementary text), pre-print</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.12521">arXiv:2212.12521</a> <span> [<a href="https://arxiv.org/pdf/2212.12521">pdf</a>, <a href="https://arxiv.org/format/2212.12521">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/2058-9565/acf47b">10.1088/2058-9565/acf47b <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum-Referenced Spontaneous Emission Tomography </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Faruque%2C+I+I">I. I. Faruque</a>, <a href="/search/quant-ph?searchtype=author&query=Burridge%2C+B+M">B. M. Burridge</a>, <a href="/search/quant-ph?searchtype=author&query=Banic%2C+M">M. Banic</a>, <a href="/search/quant-ph?searchtype=author&query=Borghi%2C+M">M. Borghi</a>, <a href="/search/quant-ph?searchtype=author&query=Sipe%2C+J+E">J. E. Sipe</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">J. G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Barreto%2C+J">J. Barreto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.12521v3-abstract-short" style="display: inline;"> We present a method of tomography that measures the joint spectral phase (JSP) of spontaneously emitted photon pairs originating from a largely uncharacterized ``target" source. We use quantum interference between our target source and a reference source to extract the JSP with four spectrally resolved measurements, in a process that we call quantum-referenced spontaneous emission tomography (Q-Sp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.12521v3-abstract-full').style.display = 'inline'; document.getElementById('2212.12521v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.12521v3-abstract-full" style="display: none;"> We present a method of tomography that measures the joint spectral phase (JSP) of spontaneously emitted photon pairs originating from a largely uncharacterized ``target" source. We use quantum interference between our target source and a reference source to extract the JSP with four spectrally resolved measurements, in a process that we call quantum-referenced spontaneous emission tomography (Q-SpET). We have demonstrated this method on a photonic integrated circuit for a target micro-ring resonator photon-pair source. Our results show that spontaneously emitted photon pairs from a micro-ring resonator are distinctively different from that of stimulated emission, and thus cannot in general be fully characterized using classical stimulated emission tomography without detailed knowledge of the source. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.12521v3-abstract-full').style.display = 'none'; document.getElementById('2212.12521v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Quantum Sci. Technol. 8 045024 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.10814">arXiv:2211.10814</a> <span> [<a href="https://arxiv.org/pdf/2211.10814">pdf</a>, <a href="https://arxiv.org/format/2211.10814">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Space Physics">physics.space-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1117/12.2645103">10.1117/12.2645103 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Design and test of optical payload for polarization encoded QKD for Nanosatellites </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Sagar%2C+J">Jaya Sagar</a>, <a href="/search/quant-ph?searchtype=author&query=Hastings%2C+E">Elliott Hastings</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+P">Piede Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Stefko%2C+M">Milan Stefko</a>, <a href="/search/quant-ph?searchtype=author&query=Lowndes%2C+D">David Lowndes</a>, <a href="/search/quant-ph?searchtype=author&query=Oi%2C+D">Daniel Oi</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S+K">Siddarth K. Joshi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.10814v1-abstract-short" style="display: inline;"> Satellite based Quantum Key Distribution (QKD) in Low Earth Orbit (LEO) is currently the only viable technology to span thousands of kilometres. Since the typical overhead pass of a satellite lasts for a few minutes, it is crucial to increase the the signal rate to maximise the secret key length. For the QUARC CubeSat mission due to be launched within two years, we are designing a dual wavelength,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.10814v1-abstract-full').style.display = 'inline'; document.getElementById('2211.10814v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.10814v1-abstract-full" style="display: none;"> Satellite based Quantum Key Distribution (QKD) in Low Earth Orbit (LEO) is currently the only viable technology to span thousands of kilometres. Since the typical overhead pass of a satellite lasts for a few minutes, it is crucial to increase the the signal rate to maximise the secret key length. For the QUARC CubeSat mission due to be launched within two years, we are designing a dual wavelength, weak-coherent-pulse decoy-state Bennett-Brassard '84 (WCP DS BB84) QKD source. The optical payload is designed in a $12{\times}9{\times}5 cm^3$ bespoke aluminium casing. The Discrete Variable QKD Source consists of two symmetric sources operating at 785 nm and 808 nm. The laser diodes are fixed to produce Horizontal,Vertical, Diagonal, and Anti-diagonal (H,V,D,A) polarisation respectively, which are combined and attenuated to a mean photon number of 0.3 and 0.5 photons/pulse. We ensure that the source is secure against most side channel attacks by spatially mode filtering the output beam and characterising their spectral and temporal characterstics. The extinction ratio of the source contributes to the intrinsic Qubit Error Rate(QBER) with $0.817 \pm 0.001\%$. This source operates at 200MHz, which is enough to provide secure key rates of a few kilo bits per second despite 40 dB of estimated loss in the free space channel <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.10814v1-abstract-full').style.display = 'none'; document.getElementById('2211.10814v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> SPIE Proceedings 12335, Quantum Technology: Driving Commercialisation of an Enabling Science III, 1233509 (11 January 2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.09051">arXiv:2211.09051</a> <span> [<a href="https://arxiv.org/pdf/2211.09051">pdf</a>, <a href="https://arxiv.org/format/2211.09051">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1117/12.2645095">10.1117/12.2645095 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Entanglement distribution quantum networking within deployed telecommunications fibre-optic infrastructure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Clark%2C+M+J">Marcus J Clark</a>, <a href="/search/quant-ph?searchtype=author&query=Alia%2C+O">Obada Alia</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+R">Rui Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Bahrani%2C+S">Sima Bahrani</a>, <a href="/search/quant-ph?searchtype=author&query=Peranic%2C+M">Matej Peranic</a>, <a href="/search/quant-ph?searchtype=author&query=Aktas%2C+D">Djeylan Aktas</a>, <a href="/search/quant-ph?searchtype=author&query=Kanellos%2C+G+T">George T Kanellos</a>, <a href="/search/quant-ph?searchtype=author&query=Loncaric%2C+M">Martin Loncaric</a>, <a href="/search/quant-ph?searchtype=author&query=Samec%2C+Z">Zeljko Samec</a>, <a href="/search/quant-ph?searchtype=author&query=Radman%2C+A">Anton Radman</a>, <a href="/search/quant-ph?searchtype=author&query=Stipcevic%2C+M">Mario Stipcevic</a>, <a href="/search/quant-ph?searchtype=author&query=Nejabati%2C+R">Reza Nejabati</a>, <a href="/search/quant-ph?searchtype=author&query=Simeonidou%2C+D">Dimitra Simeonidou</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S+K">Siddarth K Joshi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.09051v4-abstract-short" style="display: inline;"> Quantum networks have been shown to connect users with full-mesh topologies without trusted nodes. We present advancements on our scalable polarisation entanglement-based quantum network testbed, which has the ability to perform protocols beyond simple quantum key distribution. Our approach utilises wavelength multiplexing, which is ideal for quantum networks across local metropolitan areas due to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09051v4-abstract-full').style.display = 'inline'; document.getElementById('2211.09051v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.09051v4-abstract-full" style="display: none;"> Quantum networks have been shown to connect users with full-mesh topologies without trusted nodes. We present advancements on our scalable polarisation entanglement-based quantum network testbed, which has the ability to perform protocols beyond simple quantum key distribution. Our approach utilises wavelength multiplexing, which is ideal for quantum networks across local metropolitan areas due to the ease of connecting additional users to the network without increasing the resource requirements per user. We show a 10 user fully connected quantum network with metropolitan scale deployed fibre links, demonstrating polarisation stability and the ability to generate secret keys over a period of 10.8 days with a network wide average-effective secret key rate of 3.38 bps. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09051v4-abstract-full').style.display = 'none'; document.getElementById('2211.09051v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 4 figures, 2 tables, SPIE Photonex 2022 conference proceedings</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Proc. SPIE 12335, Quantum Technology: Driving Commercialisation of an Enabling Science III, 123350E (11 January 2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.11285">arXiv:2210.11285</a> <span> [<a href="https://arxiv.org/pdf/2210.11285">pdf</a>, <a href="https://arxiv.org/format/2210.11285">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Responsive Operations for Key Services (ROKS): A Modular, Low SWaP Quantum Communications Payload </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Colquhoun%2C+C+D">Craig D. Colquhoun</a>, <a href="/search/quant-ph?searchtype=author&query=Jeffrey%2C+H">Hazel Jeffrey</a>, <a href="/search/quant-ph?searchtype=author&query=Greenland%2C+S">Steve Greenland</a>, <a href="/search/quant-ph?searchtype=author&query=Mohapatra%2C+S">Sonali Mohapatra</a>, <a href="/search/quant-ph?searchtype=author&query=Aitken%2C+C">Colin Aitken</a>, <a href="/search/quant-ph?searchtype=author&query=Cebecauer%2C+M">Mikulas Cebecauer</a>, <a href="/search/quant-ph?searchtype=author&query=Crawshaw%2C+C">Charlotte Crawshaw</a>, <a href="/search/quant-ph?searchtype=author&query=Jeffrey%2C+K">Kenny Jeffrey</a>, <a href="/search/quant-ph?searchtype=author&query=Jeffreys%2C+T">Toby Jeffreys</a>, <a href="/search/quant-ph?searchtype=author&query=Karagiannakis%2C+P">Philippos Karagiannakis</a>, <a href="/search/quant-ph?searchtype=author&query=McTaggart%2C+A">Ahren McTaggart</a>, <a href="/search/quant-ph?searchtype=author&query=Stark%2C+C">Caitlin Stark</a>, <a href="/search/quant-ph?searchtype=author&query=Wood%2C+J">Jack Wood</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S+K">Siddarth K. Joshi</a>, <a href="/search/quant-ph?searchtype=author&query=Sagar%2C+J">Jaya Sagar</a>, <a href="/search/quant-ph?searchtype=author&query=Hastings%2C+E">Elliott Hastings</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+P">Peide Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Stefko%2C+M">Milan Stefko</a>, <a href="/search/quant-ph?searchtype=author&query=Lowndes%2C+D">David Lowndes</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Sidhu%2C+J+S">Jasminder S. Sidhu</a>, <a href="/search/quant-ph?searchtype=author&query=Brougham%2C+T">Thomas Brougham</a>, <a href="/search/quant-ph?searchtype=author&query=McArthur%2C+D">Duncan McArthur</a>, <a href="/search/quant-ph?searchtype=author&query=Pousa%2C+R+G">Robert G. Pousa</a>, <a href="/search/quant-ph?searchtype=author&query=Oi%2C+D+K+L">Daniel K. L. Oi</a> , et al. (3 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.11285v1-abstract-short" style="display: inline;"> Quantum key distribution (QKD) is a theoretically proven future-proof secure encryption method that inherits its security from fundamental physical principles. Craft Prospect, working with a number of UK organisations, has been focused on miniaturising the technologies that enable QKD so that they may be used in smaller platforms including nanosatellites. The significant reduction of size, and the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.11285v1-abstract-full').style.display = 'inline'; document.getElementById('2210.11285v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.11285v1-abstract-full" style="display: none;"> Quantum key distribution (QKD) is a theoretically proven future-proof secure encryption method that inherits its security from fundamental physical principles. Craft Prospect, working with a number of UK organisations, has been focused on miniaturising the technologies that enable QKD so that they may be used in smaller platforms including nanosatellites. The significant reduction of size, and therefore the cost of launching quantum communication technologies either on a dedicated platform or hosted as part of a larger optical communications will improve potential access to quantum encryption on a relatively quick timescale. The ROKS mission seeks to be among the first to send a QKD payload on a CubeSat into low Earth orbit, demonstrating the capabilities of newly developed modular quantum technologies. The ROKS payload comprises a quantum source module that supplies photons randomly in any of four linear polarisation states fed from a quantum random number generator; an acquisition, pointing, and tracking system to fine-tune alignment of the quantum source beam with an optical ground station; an imager that will detect cloud cover autonomously; and an onboard computer that controls and monitors the other modules, which manages the payload and assures the overall performance and security of the system. Each of these modules have been developed with low SWaP for CubeSats, but with interoperability in mind for other satellite form factors. We present each of the listed components, together with the initial test results from our test bench and the performance of our protoflight models prior to initial integration with the 6U CubeSat platform systems. The completed ROKS payload will be ready for flight at the end of 2022, with various modular components already being baselined for flight and integrated into third party communication missions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.11285v1-abstract-full').style.display = 'none'; document.getElementById('2210.11285v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages with 25 figures. Presented at Small Satellite Conference: https://digitalcommons.usu.edu/smallsat/2022/all2022/163/. Any comments are welcome</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.15289">arXiv:2209.15289</a> <span> [<a href="https://arxiv.org/pdf/2209.15289">pdf</a>, <a href="https://arxiv.org/format/2209.15289">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1364/OPTCON.524280">10.1364/OPTCON.524280 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Methane sensing in the mid-IR using short wave IR photon counting detectors via non-linear interferometry </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Cardoso%2C+A+C">Arthur C. Cardoso</a>, <a href="/search/quant-ph?searchtype=author&query=Dong%2C+J">Jinghan Dong</a>, <a href="/search/quant-ph?searchtype=author&query=Zhou%2C+H">Haichen Zhou</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S+K">Siddarth K. Joshi</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.15289v2-abstract-short" style="display: inline;"> We demonstrate a novel MIR methane sensor shifting measurement wavelength to SWIR (1.55$渭$m) by using non-linear interferometry. The technique exploits the interference effects seen in three-wave mixing when pump, signal, and idler modes make a double pass through a nonlinear crystal. The method allows sensing at wavelengths where detectors are poor ($>$3$渭$m) and detection at wavelengths where ph… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.15289v2-abstract-full').style.display = 'inline'; document.getElementById('2209.15289v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.15289v2-abstract-full" style="display: none;"> We demonstrate a novel MIR methane sensor shifting measurement wavelength to SWIR (1.55$渭$m) by using non-linear interferometry. The technique exploits the interference effects seen in three-wave mixing when pump, signal, and idler modes make a double pass through a nonlinear crystal. The method allows sensing at wavelengths where detectors are poor ($>$3$渭$m) and detection at wavelengths where photon counting sensitivity can be achieved. In a first experimental demonstration, we measured a small methane concentration inside a gas cell with high precision. This interferometer can be built in a compact design for field operations and potentially enable the detection of low concentrations of methane at up to 100m range. Signal-to-noise ratio calculations show that the method can outperform existing short wavelength ($\sim$1.65$渭$m) integrated path differential absorption direct sensing at high ($>$$10^{-4}$) non-linear gain. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.15289v2-abstract-full').style.display = 'none'; document.getElementById('2209.15289v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Title change, new data, significant revision, 10 pages 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Optics Continuum, 3(5), 823-832 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.14317">arXiv:2209.14317</a> <span> [<a href="https://arxiv.org/pdf/2209.14317">pdf</a>, <a href="https://arxiv.org/format/2209.14317">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Quantifying Hidden Nonlinear Noise in Integrated Photonics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Burridge%2C+B+M">Ben M. Burridge</a>, <a href="/search/quant-ph?searchtype=author&query=Faruque%2C+I+I">Imad I. Faruque</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Barreto%2C+J">Jorge Barreto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.14317v1-abstract-short" style="display: inline;"> We present experimental and simulated results to quantify the impact of nonlinear noise in integrated photonic devices relying on spontaneous four-wave mixing. Our results highlight the need for design rule adaptations to mitigate the otherwise intrinsic reduction in quantum state purity. The best strategy in devices with multiple parallel photon sources is to strictly limit photon generation outs… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.14317v1-abstract-full').style.display = 'inline'; document.getElementById('2209.14317v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.14317v1-abstract-full" style="display: none;"> We present experimental and simulated results to quantify the impact of nonlinear noise in integrated photonic devices relying on spontaneous four-wave mixing. Our results highlight the need for design rule adaptations to mitigate the otherwise intrinsic reduction in quantum state purity. The best strategy in devices with multiple parallel photon sources is to strictly limit photon generation outside of the sources. Otherwise, our results suggest that purity can decrease below 40%. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.14317v1-abstract-full').style.display = 'none'; document.getElementById('2209.14317v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 5 figures, pre-print</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.13584">arXiv:2208.13584</a> <span> [<a href="https://arxiv.org/pdf/2208.13584">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjqt/s40507-023-00187-w">10.1140/epjqt/s40507-023-00187-w <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Polarization compensation methods for quantum communication networks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Peranic%2C+M">Matej Peranic</a>, <a href="/search/quant-ph?searchtype=author&query=Clark%2C+M">Marcus Clark</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+R">Rui Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Bahrani%2C+S">Sima Bahrani</a>, <a href="/search/quant-ph?searchtype=author&query=Alia%2C+O">Obada Alia</a>, <a href="/search/quant-ph?searchtype=author&query=Wengerowsky%2C+S">Soren Wengerowsky</a>, <a href="/search/quant-ph?searchtype=author&query=Radman%2C+A">Anton Radman</a>, <a href="/search/quant-ph?searchtype=author&query=Loncaric%2C+M">Martin Loncaric</a>, <a href="/search/quant-ph?searchtype=author&query=Stipcevic%2C+M">Mario Stipcevic</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Nejabati%2C+R">Reza Nejabati</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S+K">Siddarth K Joshi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2208.13584v2-abstract-short" style="display: inline;"> The information-theoretic unconditional security offered by quantum key distribution has spurred the development of larger quantum communication networks. However, as these networks grow so does the strong need to reduce complexity and overheads. Polarization based entanglement distribution networks are a promising approach due to their scalability and lack of trusted nodes. Nevertheless, they are… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.13584v2-abstract-full').style.display = 'inline'; document.getElementById('2208.13584v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.13584v2-abstract-full" style="display: none;"> The information-theoretic unconditional security offered by quantum key distribution has spurred the development of larger quantum communication networks. However, as these networks grow so does the strong need to reduce complexity and overheads. Polarization based entanglement distribution networks are a promising approach due to their scalability and lack of trusted nodes. Nevertheless, they are only viable if the birefringence of all optical distribution fibres in the network is compensated to preserve the polarization based quantum state. The brute force approach would require a few hundred fibre polarization controllers for even a moderately sized network. Instead, we propose and investigate four different methods of polarization compensation. We compare them based on complexity, effort, level of disruption to network operations and performance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.13584v2-abstract-full').style.display = 'none'; document.getElementById('2208.13584v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> EPJ Quantum Technol. 10, 30 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.13539">arXiv:2207.13539</a> <span> [<a href="https://arxiv.org/pdf/2207.13539">pdf</a>, <a href="https://arxiv.org/format/2207.13539">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Interaction-Free Polarimetry </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J+R">Jonte R. Hance</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.13539v2-abstract-short" style="display: inline;"> The combination of interaction-free measurement and the quantum Zeno effect has been shown to both increase the signal-to-noise ratio of imaging, and decrease the light intensity flux through the imaged object. So far though, this has only been considered for discrimination between translucent and opaque areas of an object. In this paper, we extend this to the polarimetry of a given sample. This w… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.13539v2-abstract-full').style.display = 'inline'; document.getElementById('2207.13539v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.13539v2-abstract-full" style="display: none;"> The combination of interaction-free measurement and the quantum Zeno effect has been shown to both increase the signal-to-noise ratio of imaging, and decrease the light intensity flux through the imaged object. So far though, this has only been considered for discrimination between translucent and opaque areas of an object. In this paper, we extend this to the polarimetry of a given sample. This will allow the identification and characterisation of these samples with far less absorbed energy than current approaches -- a key concern for delicate samples being probed with high-frequency radiation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.13539v2-abstract-full').style.display = 'none'; document.getElementById('2207.13539v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 5 figures. v2: fixed figure issues. Comments welcome!</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.07270">arXiv:2207.07270</a> <span> [<a href="https://arxiv.org/pdf/2207.07270">pdf</a>, <a href="https://arxiv.org/format/2207.07270">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.108.012215">10.1103/PhysRevA.108.012215 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Controlling and measuring a superposition of position and momentum </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Ono%2C+T">Takafumi Ono</a>, <a href="/search/quant-ph?searchtype=author&query=Samantarray%2C+N">Nigam Samantarray</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.07270v1-abstract-short" style="display: inline;"> The dynamics of a particle propagating in free space is described by its position and momentum, where quantum mechanics prohibits the simultaneous identification of two non-commutative physical quantities. Recently, a lower bound on the probability of finding a particle after propagating for a given time has been derived for well-defined initial constraints on position and momentum under the assum… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.07270v1-abstract-full').style.display = 'inline'; document.getElementById('2207.07270v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.07270v1-abstract-full" style="display: none;"> The dynamics of a particle propagating in free space is described by its position and momentum, where quantum mechanics prohibits the simultaneous identification of two non-commutative physical quantities. Recently, a lower bound on the probability of finding a particle after propagating for a given time has been derived for well-defined initial constraints on position and momentum under the assumption that particles travel in straight lines. Here, we investigate this lower limit experimentally with photons. We prepared a superposition of position and momentum states by using slits, lenses and an interferometer, and observed a quantum interference between position and momentum. The lower bound was then evaluated using the initial state and the result was 5.9\% below this classical bound. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.07270v1-abstract-full').style.display = 'none'; document.getElementById('2207.07270v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.05596">arXiv:2207.05596</a> <span> [<a href="https://arxiv.org/pdf/2207.05596">pdf</a>, <a href="https://arxiv.org/format/2207.05596">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Quantum modulation of a coherent state wavepacket with a single electron spin </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Androvitsaneas%2C+P">P. Androvitsaneas</a>, <a href="/search/quant-ph?searchtype=author&query=Young%2C+A+B">A. B. Young</a>, <a href="/search/quant-ph?searchtype=author&query=Nutz%2C+T">T. Nutz</a>, <a href="/search/quant-ph?searchtype=author&query=Lennon%2C+J+M">J. M. Lennon</a>, <a href="/search/quant-ph?searchtype=author&query=Mister%2C+S">S. Mister</a>, <a href="/search/quant-ph?searchtype=author&query=Schneider%2C+C">C. Schneider</a>, <a href="/search/quant-ph?searchtype=author&query=Kamp%2C+M">M. Kamp</a>, <a href="/search/quant-ph?searchtype=author&query=H%C3%B6fling%2C+S">S. H枚fling</a>, <a href="/search/quant-ph?searchtype=author&query=McCutcheon%2C+D+P+S">D. P. S. McCutcheon</a>, <a href="/search/quant-ph?searchtype=author&query=Harbord%2C+E">E. Harbord</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">J. G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Oulton%2C+R">R. Oulton</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.05596v1-abstract-short" style="display: inline;"> The interaction of quantum objects lies at the heart of fundamental quantum physics and is key to a wide range of quantum information technologies. Photon-quantum-emitter interactions are among the most widely studied. Two-qubit interactions are generally simplified into two quantum objects in static well-defined states . In this work we explore a fundamentally new dynamic type of spin-photon inte… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.05596v1-abstract-full').style.display = 'inline'; document.getElementById('2207.05596v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.05596v1-abstract-full" style="display: none;"> The interaction of quantum objects lies at the heart of fundamental quantum physics and is key to a wide range of quantum information technologies. Photon-quantum-emitter interactions are among the most widely studied. Two-qubit interactions are generally simplified into two quantum objects in static well-defined states . In this work we explore a fundamentally new dynamic type of spin-photon interaction. We demonstrate modulation of a coherent narrowband wavepacket with another truly quantum object, a quantum dot with ground state spin degree of freedom. What results is a quantum modulation of the wavepacket phase (either 0 or 蟺 but no values in between), a new quantum state of light that cannot be described classically. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.05596v1-abstract-full').style.display = 'none'; document.getElementById('2207.05596v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Supplementary Information available on request</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2204.03374">arXiv:2204.03374</a> <span> [<a href="https://arxiv.org/pdf/2204.03374">pdf</a>, <a href="https://arxiv.org/format/2204.03374">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="History and Philosophy of Physics">physics.hist-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/ad6476">10.1088/1367-2630/ad6476 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Is the dynamical quantum Cheshire cat detectable? </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J+R">Jonte R. Hance</a>, <a href="/search/quant-ph?searchtype=author&query=Ladyman%2C+J">James Ladyman</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2204.03374v3-abstract-short" style="display: inline;"> We explore how one might detect the dynamical quantum Cheshire cat proposed by Aharonov et al. We show that, in practice, we need to bias the initial state by adding/subtracting a small probability amplitude (`field') of the orthogonal state, which travels with the disembodied property, to make the effect detectable (i.e. if our initial state is $|\uparrow_z\rangle$, we need to bias this with some… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.03374v3-abstract-full').style.display = 'inline'; document.getElementById('2204.03374v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2204.03374v3-abstract-full" style="display: none;"> We explore how one might detect the dynamical quantum Cheshire cat proposed by Aharonov et al. We show that, in practice, we need to bias the initial state by adding/subtracting a small probability amplitude (`field') of the orthogonal state, which travels with the disembodied property, to make the effect detectable (i.e. if our initial state is $|\uparrow_z\rangle$, we need to bias this with some small amount $未$ of state $|\downarrow_z\rangle$). This biasing, which can be done either directly or via weakly entangling the state with a pointer, effectively provides a phase reference with which we can measure the evolution of the state. The outcome can then be measured as a small probability difference in detections in a mutually unbiased basis, proportional to this biasing $未$. We show this is different from counterfactual communication, which provably does not require any probe field to travel between sender Bob and receiver Alice for communication. We further suggest an optical polarisation experiment where these phenomena might be demonstrated in a laboratory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.03374v3-abstract-full').style.display = 'none'; document.getElementById('2204.03374v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 4 figures. Accepted for publication at New Journal of Physics, matches accepted version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys. 26 073038 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2202.04641">arXiv:2202.04641</a> <span> [<a href="https://arxiv.org/pdf/2202.04641">pdf</a>, <a href="https://arxiv.org/format/2202.04641">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cryptography and Security">cs.CR</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/ac8e25">10.1088/1367-2630/ac8e25 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unconditionally secure digital signatures implemented in an 8-user quantum network </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Pelet%2C+Y">Yoann Pelet</a>, <a href="/search/quant-ph?searchtype=author&query=Puthoor%2C+I+V">Ittoop Vergheese Puthoor</a>, <a href="/search/quant-ph?searchtype=author&query=Venkatachalam%2C+N">Natarajan Venkatachalam</a>, <a href="/search/quant-ph?searchtype=author&query=Wengerowsky%2C+S">S枚ren Wengerowsky</a>, <a href="/search/quant-ph?searchtype=author&query=Lon%C4%8Dari%C4%87%2C+M">Martin Lon膷ari膰</a>, <a href="/search/quant-ph?searchtype=author&query=Neumann%2C+S+P">Sebastian Philipp Neumann</a>, <a href="/search/quant-ph?searchtype=author&query=Liu%2C+B">Bo Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Samec%2C+%C5%BD">沤eljko Samec</a>, <a href="/search/quant-ph?searchtype=author&query=Stip%C4%8Devi%C4%87%2C+M">Mario Stip膷evi膰</a>, <a href="/search/quant-ph?searchtype=author&query=Ursin%2C+R">Rupert Ursin</a>, <a href="/search/quant-ph?searchtype=author&query=Andersson%2C+E">Erika Andersson</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Aktas%2C+D">Djeylan Aktas</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S+K">Siddarth Koduru Joshi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2202.04641v2-abstract-short" style="display: inline;"> The ability to know and verifiably demonstrate the origins of messages can often be as important as encrypting the message itself. Here we present an experimental demonstration of an unconditionally secure digital signature (USS) protocol implemented for the first time, to the best of our knowledge, on a fully connected quantum network without trusted nodes. Our USS protocol is secure against forg… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.04641v2-abstract-full').style.display = 'inline'; document.getElementById('2202.04641v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2202.04641v2-abstract-full" style="display: none;"> The ability to know and verifiably demonstrate the origins of messages can often be as important as encrypting the message itself. Here we present an experimental demonstration of an unconditionally secure digital signature (USS) protocol implemented for the first time, to the best of our knowledge, on a fully connected quantum network without trusted nodes. Our USS protocol is secure against forging, repudiation and messages are transferrable. We show the feasibility of unconditionally secure signatures using only bi-partite entangled states distributed throughout the network and experimentally evaluate the performance of the protocol in real world scenarios with varying message lengths. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.04641v2-abstract-full').style.display = 'none'; document.getElementById('2202.04641v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Preprint, 9 pages, 7 figures, 1 table</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.01124">arXiv:2110.01124</a> <span> [<a href="https://arxiv.org/pdf/2110.01124">pdf</a>, <a href="https://arxiv.org/format/2110.01124">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Un-symmetric photon subtraction: a method for generating high photon number states and their relevance to loss estimation at ultimate quantum limit </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Samantaray%2C+N">N. Samantaray</a>, <a href="/search/quant-ph?searchtype=author&query=Matthews%2C+J+C+F">J. C. F. Matthews</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">J. G. Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.01124v1-abstract-short" style="display: inline;"> We have studied theoretical un-symmetric multi-photon subtracted twin beam state and demonstrated a method for generating states that resembles to high photon number states with the increase in the number of subtracted photons through Wigner distribution function, which can be reconstructed experimentally by Homodyne measurement. A crucial point is high non-classicality is obtained by photon subtr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.01124v1-abstract-full').style.display = 'inline'; document.getElementById('2110.01124v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.01124v1-abstract-full" style="display: none;"> We have studied theoretical un-symmetric multi-photon subtracted twin beam state and demonstrated a method for generating states that resembles to high photon number states with the increase in the number of subtracted photons through Wigner distribution function, which can be reconstructed experimentally by Homodyne measurement. A crucial point is high non-classicality is obtained by photon subtraction when mean photons per mode of twin beam state is low. We have calculated photon statistics from the phase space distribution function and found sub-poissonian behaviour in the same low mean photons regime. Furthermore, we have tested the usefulness of such states for realistic absorption measurement including detection losses by computing quantum Fisher-Information from measured Wigner function after interaction the sample. We have compared the performance of these states with respect to coherent and demonstrated how the quantum advantage is related to non-classical enhancement. We presented results up to three photon subtraction which show remarkable quantum advantage over both initial thermal and coherent state reaching the ultimate quantum limit in the loss estimation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.01124v1-abstract-full').style.display = 'none'; document.getElementById('2110.01124v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 page, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.14060">arXiv:2109.14060</a> <span> [<a href="https://arxiv.org/pdf/2109.14060">pdf</a>, <a href="https://arxiv.org/format/2109.14060">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="History and Philosophy of Physics">physics.hist-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevResearch.5.023048">10.1103/PhysRevResearch.5.023048 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Weak values and the past of a quantum particle </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J+R">Jonte R. Hance</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Ladyman%2C+J">James Ladyman</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2109.14060v5-abstract-short" style="display: inline;"> We investigate four key issues with using a nonzero weak value of the spatial projection operator to infer the past path of an individual quantum particle. First, we note that weak measurements disturb a system, so any approach relying on such a perturbation to determine the location of a quantum particle describes the state of a disturbed system, not that of a hypothetical undisturbed system. Sec… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.14060v5-abstract-full').style.display = 'inline'; document.getElementById('2109.14060v5-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.14060v5-abstract-full" style="display: none;"> We investigate four key issues with using a nonzero weak value of the spatial projection operator to infer the past path of an individual quantum particle. First, we note that weak measurements disturb a system, so any approach relying on such a perturbation to determine the location of a quantum particle describes the state of a disturbed system, not that of a hypothetical undisturbed system. Secondly, even assuming no disturbance, there is no reason to associate the non-zero weak value of an operator containing the spatial projection operator with the classical idea of `particle presence'. Thirdly, weak values are only measurable over ensembles, and so to infer properties of individual particles from values of them is problematic. Finally, weak value approaches to the path of a particle do not provide information beyond standard quantum mechanics (and the classical modes supporting the experiment). We know of no experiment with testable consequences that demonstrates a connection between particle presence and weak values. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.14060v5-abstract-full').style.display = 'none'; document.getElementById('2109.14060v5-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 2 figures. Matches published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Research 5, 023048 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.08718">arXiv:2106.08718</a> <span> [<a href="https://arxiv.org/pdf/2106.08718">pdf</a>, <a href="https://arxiv.org/format/2106.08718">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.ijleo.2021.167451">10.1016/j.ijleo.2021.167451 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Comment on "Scheme of the arrangement for attack on the protocol BB84" </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J+R">Jonte R. Hance</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2106.08718v1-abstract-short" style="display: inline;"> In a recent paper (Scheme of the arrangement for attack on the protocol BB84, Optik 127(18):7083-7087, Sept 2016), a protocol was proposed for using weak measurement to attack BB84. This claimed the four basis states typically used could be perfectly discriminated, and so an interceptor could obtain all information carried. We show this attack fails when considered using standard quantum mechanics… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.08718v1-abstract-full').style.display = 'inline'; document.getElementById('2106.08718v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.08718v1-abstract-full" style="display: none;"> In a recent paper (Scheme of the arrangement for attack on the protocol BB84, Optik 127(18):7083-7087, Sept 2016), a protocol was proposed for using weak measurement to attack BB84. This claimed the four basis states typically used could be perfectly discriminated, and so an interceptor could obtain all information carried. We show this attack fails when considered using standard quantum mechanics, as expected - such ``single-shot" quantum state discrimination is impossible, even using weak measurement. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.08718v1-abstract-full').style.display = 'none'; document.getElementById('2106.08718v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, 1 figure, accepted for publication by Optik</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Optik 243 167451 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.11717">arXiv:2104.11717</a> <span> [<a href="https://arxiv.org/pdf/2104.11717">pdf</a>, <a href="https://arxiv.org/ps/2104.11717">ps</a>, <a href="https://arxiv.org/format/2104.11717">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41534-022-00524-4">10.1038/s41534-022-00524-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Practical quantum tokens without quantum memories and experimental tests </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Kent%2C+A">Adrian Kent</a>, <a href="/search/quant-ph?searchtype=author&query=Lowndes%2C+D">David Lowndes</a>, <a href="/search/quant-ph?searchtype=author&query=Pital%C3%BAa-Garc%C3%ADa%2C+D">Dami谩n Pital煤a-Garc铆a</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.11717v4-abstract-short" style="display: inline;"> Unforgeable quantum money tokens were the first invention of quantum information science, but remain technologically challenging as they require quantum memories and/or long distance quantum communication. More recently, virtual 'S-money' tokens were introduced. These are generated by quantum cryptography, do not require quantum memories or long distance quantum communication, and yet in principle… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.11717v4-abstract-full').style.display = 'inline'; document.getElementById('2104.11717v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.11717v4-abstract-full" style="display: none;"> Unforgeable quantum money tokens were the first invention of quantum information science, but remain technologically challenging as they require quantum memories and/or long distance quantum communication. More recently, virtual 'S-money' tokens were introduced. These are generated by quantum cryptography, do not require quantum memories or long distance quantum communication, and yet in principle guarantee many of the security advantages of quantum money. Here, we describe implementations of S-money schemes with off-the-shelf quantum key distribution technology, and analyse security in the presence of noise, losses, and experimental imperfection. Our schemes satisfy near instant validation without cross-checking. We show that, given standard assumptions in mistrustful quantum cryptographic implementations, unforgeability and user privacy could be guaranteed with attainable refinements of our off-the-shelf setup. We discuss the possibilities for unconditionally secure (assumption-free) implementations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.11717v4-abstract-full').style.display = 'none'; document.getElementById('2104.11717v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> npj Quantum Inf 8, 28 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.12749">arXiv:2103.12749</a> <span> [<a href="https://arxiv.org/pdf/2103.12749">pdf</a>, <a href="https://arxiv.org/format/2103.12749">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1049/qtc2.12015">10.1049/qtc2.12015 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Advances in Space Quantum Communications </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Sidhu%2C+J+S">Jasminder S. Sidhu</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S+K">Siddarth K. Joshi</a>, <a href="/search/quant-ph?searchtype=author&query=Gundogan%2C+M">Mustafa Gundogan</a>, <a href="/search/quant-ph?searchtype=author&query=Brougham%2C+T">Thomas Brougham</a>, <a href="/search/quant-ph?searchtype=author&query=Lowndes%2C+D">David Lowndes</a>, <a href="/search/quant-ph?searchtype=author&query=Mazzarella%2C+L">Luca Mazzarella</a>, <a href="/search/quant-ph?searchtype=author&query=Krutzik%2C+M">Markus Krutzik</a>, <a href="/search/quant-ph?searchtype=author&query=Mohapatra%2C+S">Sonali Mohapatra</a>, <a href="/search/quant-ph?searchtype=author&query=Dequal%2C+D">Daniele Dequal</a>, <a href="/search/quant-ph?searchtype=author&query=Vallone%2C+G">Giuseppe Vallone</a>, <a href="/search/quant-ph?searchtype=author&query=Villoresi%2C+P">Paolo Villoresi</a>, <a href="/search/quant-ph?searchtype=author&query=Ling%2C+A">Alexander Ling</a>, <a href="/search/quant-ph?searchtype=author&query=Jennewein%2C+T">Thomas Jennewein</a>, <a href="/search/quant-ph?searchtype=author&query=Mohageg%2C+M">Makan Mohageg</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Fuentes%2C+I">Ivette Fuentes</a>, <a href="/search/quant-ph?searchtype=author&query=Pirandola%2C+S">Stefano Pirandola</a>, <a href="/search/quant-ph?searchtype=author&query=Oi%2C+D+K+L">Daniel K. L. Oi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2103.12749v1-abstract-short" style="display: inline;"> Concerted efforts are underway to establish an infrastructure for a global quantum internet to realise a spectrum of quantum technologies. This will enable more precise sensors, secure communications, and faster data processing. Quantum communications are a front-runner with quantum networks already implemented in several metropolitan areas. A number of recent proposals have modelled the use of sp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.12749v1-abstract-full').style.display = 'inline'; document.getElementById('2103.12749v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.12749v1-abstract-full" style="display: none;"> Concerted efforts are underway to establish an infrastructure for a global quantum internet to realise a spectrum of quantum technologies. This will enable more precise sensors, secure communications, and faster data processing. Quantum communications are a front-runner with quantum networks already implemented in several metropolitan areas. A number of recent proposals have modelled the use of space segments to overcome range limitations of purely terrestrial networks. Rapid progress in the design of quantum devices have enabled their deployment in space for in-orbit demonstrations. We review developments in this emerging area of space-based quantum technologies and provide a roadmap of key milestones towards a complete, global quantum networked landscape. Small satellites hold increasing promise to provide a cost effective coverage required to realised the quantum internet. We review the state of art in small satellite missions and collate the most current in-field demonstrations of quantum cryptography. We summarise important challenges in space quantum technologies that must be overcome and recent efforts to mitigate their effects. A perspective on future developments that would improve the performance of space quantum communications is included. We conclude with a discussion on fundamental physics experiments that could take advantage of a global, space-based quantum network. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.12749v1-abstract-full').style.display = 'none'; document.getElementById('2103.12749v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">26 pages, 9 figures. Comments welcome. This paper is a preprint of a paper submitted to IET Quantum Communication. If accepted, the copy of record will be available at the IET Digital Library</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> IET Quant. Comm. 2, 182-217 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2102.07795">arXiv:2102.07795</a> <span> [<a href="https://arxiv.org/pdf/2102.07795">pdf</a>, <a href="https://arxiv.org/format/2102.07795">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> </div> <p class="title is-5 mathjax"> Experimental Tests of Invariant Set Theory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J+R">Jonte R. Hance</a>, <a href="/search/quant-ph?searchtype=author&query=Palmer%2C+T+N">Tim N. Palmer</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2102.07795v2-abstract-short" style="display: inline;"> We identify points of difference between Invariant Set Theory and standard quantum theory, and show that these lead to noticeable differences in predictions between the two theories. We design a number of experiments to test which of these predictions corresponds to our world. If these experiments were undertaken, they would allow us to investigate whether standard quantum theory or invariant set… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.07795v2-abstract-full').style.display = 'inline'; document.getElementById('2102.07795v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.07795v2-abstract-full" style="display: none;"> We identify points of difference between Invariant Set Theory and standard quantum theory, and show that these lead to noticeable differences in predictions between the two theories. We design a number of experiments to test which of these predictions corresponds to our world. If these experiments were undertaken, they would allow us to investigate whether standard quantum theory or invariant set theory best describes reality. These tests can also be deployed on theories sharing similar properties (e.g. Penrose's gravitational collapse theory). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.07795v2-abstract-full').style.display = 'none'; document.getElementById('2102.07795v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2101.12225">arXiv:2101.12225</a> <span> [<a href="https://arxiv.org/pdf/2101.12225">pdf</a>, <a href="https://arxiv.org/format/2101.12225">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PRXQuantum.3.020311">10.1103/PRXQuantum.3.020311 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Scalable authentication and optimal flooding in a quantum network </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Solomons%2C+N+R">Naomi R. Solomons</a>, <a href="/search/quant-ph?searchtype=author&query=Fletcher%2C+A+I">Alasdair I. Fletcher</a>, <a href="/search/quant-ph?searchtype=author&query=Aktas%2C+D">Djeylan Aktas</a>, <a href="/search/quant-ph?searchtype=author&query=Venkatachalam%2C+N">Natarajan Venkatachalam</a>, <a href="/search/quant-ph?searchtype=author&query=Wengerowsky%2C+S">S枚ren Wengerowsky</a>, <a href="/search/quant-ph?searchtype=author&query=Lon%C4%8Dari%C4%87%2C+M">Martin Lon膷ari膰</a>, <a href="/search/quant-ph?searchtype=author&query=Neumann%2C+S+P">Sebastian P. Neumann</a>, <a href="/search/quant-ph?searchtype=author&query=Liu%2C+B">Bo Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Samec%2C+%C5%BD">沤eljko Samec</a>, <a href="/search/quant-ph?searchtype=author&query=Stip%C4%8Devi%C4%87%2C+M">Mario Stip膷evi膰</a>, <a href="/search/quant-ph?searchtype=author&query=Ursin%2C+R">Rupert Ursin</a>, <a href="/search/quant-ph?searchtype=author&query=Pirandola%2C+S">Stefano Pirandola</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S+K">Siddarth Koduru Joshi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2101.12225v2-abstract-short" style="display: inline;"> The global interest in quantum networks stems from the security guaranteed by the laws of physics. Deploying quantum networks means facing the challenges of scaling up the physical hardware and, more importantly, of scaling up all other network layers and optimally utilising network resources. Here we consider two related protocols, their experimental demonstrations on an 8-user quantum network te… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.12225v2-abstract-full').style.display = 'inline'; document.getElementById('2101.12225v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2101.12225v2-abstract-full" style="display: none;"> The global interest in quantum networks stems from the security guaranteed by the laws of physics. Deploying quantum networks means facing the challenges of scaling up the physical hardware and, more importantly, of scaling up all other network layers and optimally utilising network resources. Here we consider two related protocols, their experimental demonstrations on an 8-user quantum network test-bed, and discuss their usefulness with the aid of example use cases. First, an authentication transfer protocol to manage a fundamental limitation of quantum communication -- the need for a pre-shared key between every pair of users linked together on the quantum network. By temporarily trusting some intermediary nodes for a short period of time (<35 min in our network), we can generate and distribute these initial authentication keys with a very high level of security. Second, when end users quantify their trust in intermediary nodes, our flooding protocol can be used to improve both end-to-end communication speeds and increase security against malicious nodes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.12225v2-abstract-full').style.display = 'none'; document.getElementById('2101.12225v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">New version includes changes suggested by referees, and a modification to an incorrect calculation. Fig. 6 has been updated correspondingly. With thanks to Rui Wang for spotting the mistake, and the referees for detailed feedback</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PRX Quantum 3, 020311 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2101.06436">arXiv:2101.06436</a> <span> [<a href="https://arxiv.org/pdf/2101.06436">pdf</a>, <a href="https://arxiv.org/format/2101.06436">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="History and Philosophy of Physics">physics.hist-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s40509-022-00271-3">10.1007/s40509-022-00271-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Could wavefunctions simultaneously represent knowledge and reality? </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J+R">Jonte R. Hance</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Ladyman%2C+J">James Ladyman</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2101.06436v4-abstract-short" style="display: inline;"> In discussion of the interpretation of quantum mechanics the terms `ontic' and `epistemic' are often used in the sense of pertaining to what exists, and pertaining to cognition or knowledge respectively. The terms are also often associated with the formal definitions given by Harrigan and Spekkens for the wavefunction in quantum mechanics to be $蠄$-ontic or $蠄$-epistemic in the context of the onto… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.06436v4-abstract-full').style.display = 'inline'; document.getElementById('2101.06436v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2101.06436v4-abstract-full" style="display: none;"> In discussion of the interpretation of quantum mechanics the terms `ontic' and `epistemic' are often used in the sense of pertaining to what exists, and pertaining to cognition or knowledge respectively. The terms are also often associated with the formal definitions given by Harrigan and Spekkens for the wavefunction in quantum mechanics to be $蠄$-ontic or $蠄$-epistemic in the context of the ontological models framework. The formal definitions are contradictories, so that the wavefunction can be either $蠄$-epistemic or $蠄$-ontic but not both. However, we argue, nothing about the informal ideas of epistemic and ontic interpretations rules out wavefunctions representing both reality and knowledge. The implications of the Pusey-Barrett-Rudolph theorem and many other issues may be rethought in the light of our analysis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.06436v4-abstract-full').style.display = 'none'; document.getElementById('2101.06436v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 1 figure. Published in Quantum Studies: Mathematics and Foundations. Matches published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Quantum Stud.: Math. Found. 9, 333-341 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.09480">arXiv:2011.09480</a> <span> [<a href="https://arxiv.org/pdf/2011.09480">pdf</a>, <a href="https://arxiv.org/format/2011.09480">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cryptography and Security">cs.CR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Emerging Technologies">cs.ET</span> </div> </div> <p class="title is-5 mathjax"> Experimental implementation of secure anonymous protocols on an eight-user quantum network </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Huang%2C+Z">Zixin Huang</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S+K">Siddarth Koduru Joshi</a>, <a href="/search/quant-ph?searchtype=author&query=Aktas%2C+D">Djeylan Aktas</a>, <a href="/search/quant-ph?searchtype=author&query=Lupo%2C+C">Cosmo Lupo</a>, <a href="/search/quant-ph?searchtype=author&query=Quintavalle%2C+A+O">Armanda O. Quintavalle</a>, <a href="/search/quant-ph?searchtype=author&query=Venkatachalam%2C+N">Natarajan Venkatachalam</a>, <a href="/search/quant-ph?searchtype=author&query=Wengerowsky%2C+S">S枚ren Wengerowsky</a>, <a href="/search/quant-ph?searchtype=author&query=Lon%C4%8Dari%C4%87%2C+M">Martin Lon膷ari膰</a>, <a href="/search/quant-ph?searchtype=author&query=Neumann%2C+S+P">Sebastian Philipp Neumann</a>, <a href="/search/quant-ph?searchtype=author&query=Liu%2C+B">Bo Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Samec%2C+%C5%BD">沤eljko Samec</a>, <a href="/search/quant-ph?searchtype=author&query=Kling%2C+L">Laurent Kling</a>, <a href="/search/quant-ph?searchtype=author&query=Stip%C4%8Devi%C4%87%2C+M">Mario Stip膷evi膰</a>, <a href="/search/quant-ph?searchtype=author&query=Ursin%2C+R">Rupert Ursin</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2011.09480v1-abstract-short" style="display: inline;"> Anonymity in networked communication is vital for many privacy-preserving tasks. Secure key distribution alone is insufficient for high-security communications, often knowing who transmits a message to whom and when must also be kept hidden from an adversary. Here we experimentally demonstrate 5 information-theoretically secure anonymity protocols on an 8 user city-wide quantum network using polar… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.09480v1-abstract-full').style.display = 'inline'; document.getElementById('2011.09480v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.09480v1-abstract-full" style="display: none;"> Anonymity in networked communication is vital for many privacy-preserving tasks. Secure key distribution alone is insufficient for high-security communications, often knowing who transmits a message to whom and when must also be kept hidden from an adversary. Here we experimentally demonstrate 5 information-theoretically secure anonymity protocols on an 8 user city-wide quantum network using polarisation-entangled photon pairs. At the heart of these protocols is anonymous broadcasting, which is a cryptographic primitive that allows one user to reveal one bit of information while keeping her identity anonymous. For a network of $n$ users, the protocols retain anonymity for the sender, given less than $n-2$ users are dishonest. This is one of the earliest implementations of genuine multi-user cryptographic protocols beyond standard QKD. Our anonymous protocols enhance the functionality of any fully-connected Quantum Key Distribution network without trusted nodes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.09480v1-abstract-full').style.display = 'none'; document.getElementById('2011.09480v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 4 figures, 1 table, experimental work. ZH and SKJ contributed equally to this work and are joint first authors</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2010.14292">arXiv:2010.14292</a> <span> [<a href="https://arxiv.org/pdf/2010.14292">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41534-021-00411-4">10.1038/s41534-021-00411-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Counterfactual Ghost Imaging </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J">Jonte Hance</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2010.14292v3-abstract-short" style="display: inline;"> We give a protocol for ghost imaging in a way that is always counterfactual - while imaging an object, no light interacts with that object. This extends the idea of counterfactuality beyond communication, showing how this interesting phenomenon can be leveraged for metrology. Given, in the infinite limit, no photons ever go to the imaged object, it presents a method of imaging even the most light-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.14292v3-abstract-full').style.display = 'inline'; document.getElementById('2010.14292v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.14292v3-abstract-full" style="display: none;"> We give a protocol for ghost imaging in a way that is always counterfactual - while imaging an object, no light interacts with that object. This extends the idea of counterfactuality beyond communication, showing how this interesting phenomenon can be leveraged for metrology. Given, in the infinite limit, no photons ever go to the imaged object, it presents a method of imaging even the most light-sensitive of objects without damaging them. Even when not in the infinite limit, it still provides a many-fold improvement in visibility and signal-to-noise ratio over previous protocols, with over an order of magnitude reduction in absorbed intensity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.14292v3-abstract-full').style.display = 'none'; document.getElementById('2010.14292v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 6 figures, matches published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> npj Quantum Inf 7, 88 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.11586">arXiv:2009.11586</a> <span> [<a href="https://arxiv.org/pdf/2009.11586">pdf</a>, <a href="https://arxiv.org/format/2009.11586">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.104.063718">10.1103/PhysRevA.104.063718 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Poissonian twin beam states and the effect of symmetrical photon subtraction in loss estimations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Samantaray%2C+N">N. Samantaray</a>, <a href="/search/quant-ph?searchtype=author&query=Matthews%2C+J+C+F">J. C. F. Matthews</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">J. G. Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.11586v1-abstract-short" style="display: inline;"> We have devised an experimentally realizable model generating twin beam states whose individual beam photon statistics are varied from thermal to Poissonian keeping the non-classical mode correlation intact. We have studied the usefulness of these states for loss measurement by considering three different estimators, comparing with the correlated thermal twin beam states generated from spontaneous… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.11586v1-abstract-full').style.display = 'inline'; document.getElementById('2009.11586v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.11586v1-abstract-full" style="display: none;"> We have devised an experimentally realizable model generating twin beam states whose individual beam photon statistics are varied from thermal to Poissonian keeping the non-classical mode correlation intact. We have studied the usefulness of these states for loss measurement by considering three different estimators, comparing with the correlated thermal twin beam states generated from spontaneous parametric down conversion or four-wave mixing. We then incorporated the photon subtraction operation into the model and demonstrate their advantage in loss estimations with respect to un-subtracted states at both fixed squeezing and per photon exposure of the absorbing sample. For instance, at fixed squeezing, for two photon subtraction, up to three times advantage is found. In the latter case, albeit the advantage due to photon subtraction mostly subsides in standard regime, an unexpected result is that in some operating regimes the photon subtraction scheme can also give up to 20% advantage over the correlated Poisson beam result. We have also made a comparative study of these estimators for finding the best measurement for loss estimations. We present results for all the values of the model parameters changing the statistics of twin beam states from thermal to Poissonian. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.11586v1-abstract-full').style.display = 'none'; document.getElementById('2009.11586v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 12 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.08339">arXiv:2009.08339</a> <span> [<a href="https://arxiv.org/pdf/2009.08339">pdf</a>, <a href="https://arxiv.org/format/2009.08339">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41567-021-01333-w">10.1038/s41567-021-01333-w <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Error protected qubits in a silicon photonic chip </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Vigliar%2C+C">Caterina Vigliar</a>, <a href="/search/quant-ph?searchtype=author&query=Paesani%2C+S">Stefano Paesani</a>, <a href="/search/quant-ph?searchtype=author&query=Ding%2C+Y">Yunhong Ding</a>, <a href="/search/quant-ph?searchtype=author&query=Adcock%2C+J+C">Jeremy C. Adcock</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+J">Jianwei Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Morley-Short%2C+S">Sam Morley-Short</a>, <a href="/search/quant-ph?searchtype=author&query=Bacco%2C+D">Davide Bacco</a>, <a href="/search/quant-ph?searchtype=author&query=Oxenl%C3%B8we%2C+L+K">Leif K. Oxenl酶we</a>, <a href="/search/quant-ph?searchtype=author&query=Thompson%2C+M+G">Mark G. Thompson</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Laing%2C+A">Anthony Laing</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.08339v1-abstract-short" style="display: inline;"> General purpose quantum computers can, in principle, entangle a number of noisy physical qubits to realise composite qubits protected against errors. Architectures for measurement-based quantum computing intrinsically support error-protected qubits and are the most viable approach for constructing an all-photonic quantum computer. Here we propose and demonstrate an integrated silicon photonic arch… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.08339v1-abstract-full').style.display = 'inline'; document.getElementById('2009.08339v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.08339v1-abstract-full" style="display: none;"> General purpose quantum computers can, in principle, entangle a number of noisy physical qubits to realise composite qubits protected against errors. Architectures for measurement-based quantum computing intrinsically support error-protected qubits and are the most viable approach for constructing an all-photonic quantum computer. Here we propose and demonstrate an integrated silicon photonic architecture that both entangles multiple photons, and encodes multiple physical qubits on individual photons, to produce error-protected qubits. We realise reconfigurable graph states to compare several schemes with and without error-correction encodings and implement a range of quantum information processing tasks. We observe a success rate increase from 62.5% to 95.8% when running a phase estimation algorithm without and with error protection, respectively. Finally, we realise hypergraph states, which are a generalised class of resource states that offer protection against correlated errors. Our results show how quantum error-correction encodings can be implemented with resource-efficient photonic architectures to improve the performance of quantum algorithms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.08339v1-abstract-full').style.display = 'none'; document.getElementById('2009.08339v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.05564">arXiv:2009.05564</a> <span> [<a href="https://arxiv.org/pdf/2009.05564">pdf</a>, <a href="https://arxiv.org/format/2009.05564">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Deterministic Teleportation and Universal Computation Without Particle Exchange </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Salih%2C+H">Hatim Salih</a>, <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J+R">Jonte R. Hance</a>, <a href="/search/quant-ph?searchtype=author&query=McCutcheon%2C+W">Will McCutcheon</a>, <a href="/search/quant-ph?searchtype=author&query=Rudolph%2C+T">Terry Rudolph</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.05564v4-abstract-short" style="display: inline;"> Teleportation is a cornerstone of quantum technologies, and has played a key role in the development of quantum information theory. Pushing the limits of teleportation is therefore of particular importance. Here, we apply a different aspect of quantumness to teleportation -- namely exchange-free computation at a distance. The controlled-phase universal gate we propose, where no particles are excha… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.05564v4-abstract-full').style.display = 'inline'; document.getElementById('2009.05564v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.05564v4-abstract-full" style="display: none;"> Teleportation is a cornerstone of quantum technologies, and has played a key role in the development of quantum information theory. Pushing the limits of teleportation is therefore of particular importance. Here, we apply a different aspect of quantumness to teleportation -- namely exchange-free computation at a distance. The controlled-phase universal gate we propose, where no particles are exchanged between control and target, allows complete Bell detection among two remote parties, and is experimentally feasible. Our teleportation-with-a-twist, which we extend to telecloning, then requires no pre-shared entanglement nor classical communication between sender and receiver, with the teleported state gradually appearing at its destination. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.05564v4-abstract-full').style.display = 'none'; document.getElementById('2009.05564v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 5 figures; reference data fixed</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2008.00841">arXiv:2008.00841</a> <span> [<a href="https://arxiv.org/pdf/2008.00841">pdf</a>, <a href="https://arxiv.org/format/2008.00841">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/abd3c4">10.1088/1367-2630/abd3c4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exchange-Free Computation on an Unknown Qubit at a Distance </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Salih%2C+H">Hatim Salih</a>, <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J+R">Jonte R. Hance</a>, <a href="/search/quant-ph?searchtype=author&query=McCutcheon%2C+W">Will McCutcheon</a>, <a href="/search/quant-ph?searchtype=author&query=Rudolph%2C+T">Terry Rudolph</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2008.00841v4-abstract-short" style="display: inline;"> We present a way of directly manipulating an arbitrary qubit, without the exchange of any particles. This includes as an application the exchange-free preparation of an arbitrary quantum state at Alice by a remote classical Bob. As a result, we are able to propose a protocol that allows one party to directly enact, by means of a suitable program, any computation exchange-free on a remote second pa… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.00841v4-abstract-full').style.display = 'inline'; document.getElementById('2008.00841v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2008.00841v4-abstract-full" style="display: none;"> We present a way of directly manipulating an arbitrary qubit, without the exchange of any particles. This includes as an application the exchange-free preparation of an arbitrary quantum state at Alice by a remote classical Bob. As a result, we are able to propose a protocol that allows one party to directly enact, by means of a suitable program, any computation exchange-free on a remote second party's unknown qubit. Further, we show how to use this for the exchange-free control of a universal two-qubit gate, thus opening the possibility of directly enacting any desired algorithm remotely on a programmable quantum circuit. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.00841v4-abstract-full').style.display = 'none'; document.getElementById('2008.00841v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 4 figures. Published in New Journal of Physics - matches published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys. 23 013004 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.04875">arXiv:2006.04875</a> <span> [<a href="https://arxiv.org/pdf/2006.04875">pdf</a>, <a href="https://arxiv.org/format/2006.04875">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1364/OE.399902">10.1364/OE.399902 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum Rangefinding </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Frick%2C+S">Stefan Frick</a>, <a href="/search/quant-ph?searchtype=author&query=McMillan%2C+A">Alex McMillan</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.04875v2-abstract-short" style="display: inline;"> Quantum light generated in non-degenerate squeezers has many applications such as sub-shot-noise transmission measurements to maximise the information extracted by one photon or quantum illumination to increase the probability in target detection. However, any application thus far fails to consider the thermal characteristics of one half of the bipartite down-converted photon state often used in t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.04875v2-abstract-full').style.display = 'inline'; document.getElementById('2006.04875v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.04875v2-abstract-full" style="display: none;"> Quantum light generated in non-degenerate squeezers has many applications such as sub-shot-noise transmission measurements to maximise the information extracted by one photon or quantum illumination to increase the probability in target detection. However, any application thus far fails to consider the thermal characteristics of one half of the bipartite down-converted photon state often used in these experiments. We show here that a maximally mixed state, normally viewed as nuisance, can indeed be used to extract information about the position of an object while at the same time providing efficient camouflaging against other thermal or background light. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.04875v2-abstract-full').style.display = 'none'; document.getElementById('2006.04875v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Opt. Express 28, 37118-37128 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.13478">arXiv:2005.13478</a> <span> [<a href="https://arxiv.org/pdf/2005.13478">pdf</a>, <a href="https://arxiv.org/format/2005.13478">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevApplied.15.034029">10.1103/PhysRevApplied.15.034029 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The NV centre coupled to an ultra-small mode volume cavity: a high efficiency source of indistinguishable photons at 200 K </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Smith%2C+J+A">Joe A. Smith</a>, <a href="/search/quant-ph?searchtype=author&query=Clear%2C+C">Chloe Clear</a>, <a href="/search/quant-ph?searchtype=author&query=Balram%2C+K+C">Krishna C. Balram</a>, <a href="/search/quant-ph?searchtype=author&query=McCutcheon%2C+D+P+S">Dara P. S. McCutcheon</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.13478v2-abstract-short" style="display: inline;"> Solid state atom-like systems have great promise for linear optic quantum computing and quantum communication but are burdened by phonon sidebands and broadening due to surface charges. Nevertheless, coupling to a small mode volume cavity would allow high rates of extraction from even highly dephased emitters. We consider the nitrogen vacancy centre in diamond, a system understood to have a poor q… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.13478v2-abstract-full').style.display = 'inline'; document.getElementById('2005.13478v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.13478v2-abstract-full" style="display: none;"> Solid state atom-like systems have great promise for linear optic quantum computing and quantum communication but are burdened by phonon sidebands and broadening due to surface charges. Nevertheless, coupling to a small mode volume cavity would allow high rates of extraction from even highly dephased emitters. We consider the nitrogen vacancy centre in diamond, a system understood to have a poor quantum optics interface with highly distinguishable photons, and design a silicon nitride cavity that allows 99 % efficient extraction of photons at 200 K with an indistinguishability of > 50%, improvable by external filtering. We analyse our design using FDTD simulations, and treat optical emission using a cavity QED master equation valid at and beyond strong coupling and which includes both ZPL broadening and sideband emission. The simulated design is compact (< 10 um), and owing to its planar geometry, can be fabricated using standard silicon processes. Our work therefore points towards scalable fabrication of non-cryogenic atom-like efficient sources of indistinguishable photons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.13478v2-abstract-full').style.display = 'none'; document.getElementById('2005.13478v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 7 figures. Results for 3-level Jahn-Teller dephasing and explicit effects of the LDOS on the sideband added</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Applied 15, 034029 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2004.13168">arXiv:2004.13168</a> <span> [<a href="https://arxiv.org/pdf/2004.13168">pdf</a>, <a href="https://arxiv.org/format/2004.13168">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1364/OL.393077">10.1364/OL.393077 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High spectro-temporal purity single-photons from silicon micro-racetrack resonators using a dual-pulse configuration </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Burridge%2C+B">Ben Burridge</a>, <a href="/search/quant-ph?searchtype=author&query=Faruque%2C+I+I">Imad I. Faruque</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Barreto%2C+J">Jorge Barreto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2004.13168v1-abstract-short" style="display: inline;"> Single-photons with high spectro-temporal purity are an essential resource for quantum photonic technologies. The highest reported purity up until now from a conventional silicon photonic device is 92% without any spectral filtering. We have experimentally generated and observed single-photons with 98.0+-0.3 % spectro-temporal purity using a conventional micro racetrack resonator and an engineered… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.13168v1-abstract-full').style.display = 'inline'; document.getElementById('2004.13168v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2004.13168v1-abstract-full" style="display: none;"> Single-photons with high spectro-temporal purity are an essential resource for quantum photonic technologies. The highest reported purity up until now from a conventional silicon photonic device is 92% without any spectral filtering. We have experimentally generated and observed single-photons with 98.0+-0.3 % spectro-temporal purity using a conventional micro racetrack resonator and an engineered dual pump pulse. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.13168v1-abstract-full').style.display = 'none'; document.getElementById('2004.13168v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 April, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.06169">arXiv:2002.06169</a> <span> [<a href="https://arxiv.org/pdf/2002.06169">pdf</a>, <a href="https://arxiv.org/format/2002.06169">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Machine Learning">cs.LG</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41567-021-01201-7">10.1038/s41567-021-01201-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Learning models of quantum systems from experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Gentile%2C+A+A">Antonio A. Gentile</a>, <a href="/search/quant-ph?searchtype=author&query=Flynn%2C+B">Brian Flynn</a>, <a href="/search/quant-ph?searchtype=author&query=Knauer%2C+S">Sebastian Knauer</a>, <a href="/search/quant-ph?searchtype=author&query=Wiebe%2C+N">Nathan Wiebe</a>, <a href="/search/quant-ph?searchtype=author&query=Paesani%2C+S">Stefano Paesani</a>, <a href="/search/quant-ph?searchtype=author&query=Granade%2C+C+E">Christopher E. Granade</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Santagati%2C+R">Raffaele Santagati</a>, <a href="/search/quant-ph?searchtype=author&query=Laing%2C+A">Anthony Laing</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2002.06169v1-abstract-short" style="display: inline;"> An isolated system of interacting quantum particles is described by a Hamiltonian operator. Hamiltonian models underpin the study and analysis of physical and chemical processes throughout science and industry, so it is crucial they are faithful to the system they represent. However, formulating and testing Hamiltonian models of quantum systems from experimental data is difficult because it is imp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.06169v1-abstract-full').style.display = 'inline'; document.getElementById('2002.06169v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.06169v1-abstract-full" style="display: none;"> An isolated system of interacting quantum particles is described by a Hamiltonian operator. Hamiltonian models underpin the study and analysis of physical and chemical processes throughout science and industry, so it is crucial they are faithful to the system they represent. However, formulating and testing Hamiltonian models of quantum systems from experimental data is difficult because it is impossible to directly observe which interactions the quantum system is subject to. Here, we propose and demonstrate an approach to retrieving a Hamiltonian model from experiments, using unsupervised machine learning. We test our methods experimentally on an electron spin in a nitrogen-vacancy interacting with its spin bath environment, and numerically, finding success rates up to 86%. By building agents capable of learning science, which recover meaningful representations, we can gain further insight on the physics of quantum systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.06169v1-abstract-full').style.display = 'none'; document.getElementById('2002.06169v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">27 pages, 8 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2001.05761">arXiv:2001.05761</a> <span> [<a href="https://arxiv.org/pdf/2001.05761">pdf</a>, <a href="https://arxiv.org/format/2001.05761">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/2515-7647/abf236">10.1088/2515-7647/abf236 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Backscatter and Spontaneous Four-Wave Mixing in Micro-Ring Resonators </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J+R">Jonte R. Hance</a>, <a href="/search/quant-ph?searchtype=author&query=Sinclair%2C+G+F">Gary F. Sinclair</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2001.05761v4-abstract-short" style="display: inline;"> We model backscatter for electric fields propagating through optical micro-ring resonators, as occurring both in-ring and in-coupler. These provide useful tools for modelling transmission and in-ring fields in these optical devices. We then discuss spontaneous four-wave mixing and use the models to obtain heralding efficiencies and rates. We observe a trade-off between these, which becomes more ex… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.05761v4-abstract-full').style.display = 'inline'; document.getElementById('2001.05761v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2001.05761v4-abstract-full" style="display: none;"> We model backscatter for electric fields propagating through optical micro-ring resonators, as occurring both in-ring and in-coupler. These provide useful tools for modelling transmission and in-ring fields in these optical devices. We then discuss spontaneous four-wave mixing and use the models to obtain heralding efficiencies and rates. We observe a trade-off between these, which becomes more extreme as the rings become more strongly backscattered. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.05761v4-abstract-full').style.display = 'none'; document.getElementById('2001.05761v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 January, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 8 figures - matches version published in J. Phys. Photonics</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. Photonics 3 (2021) 025003 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.07839">arXiv:1911.07839</a> <span> [<a href="https://arxiv.org/pdf/1911.07839">pdf</a>, <a href="https://arxiv.org/format/1911.07839">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41567-019-0727-x">10.1038/s41567-019-0727-x <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Chip-to-chip quantum teleportation and multi-photon entanglement in silicon </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Llewellyn%2C+D">Daniel Llewellyn</a>, <a href="/search/quant-ph?searchtype=author&query=Ding%2C+Y">Yunhong Ding</a>, <a href="/search/quant-ph?searchtype=author&query=Faruque%2C+I+I">Imad I. Faruque</a>, <a href="/search/quant-ph?searchtype=author&query=Paesani%2C+S">Stefano Paesani</a>, <a href="/search/quant-ph?searchtype=author&query=Bacco%2C+D">Davide Bacco</a>, <a href="/search/quant-ph?searchtype=author&query=Santagati%2C+R">Raffaele Santagati</a>, <a href="/search/quant-ph?searchtype=author&query=Qian%2C+Y">Yan-Jun Qian</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+Y">Yan Li</a>, <a href="/search/quant-ph?searchtype=author&query=Xiao%2C+Y">Yun-Feng Xiao</a>, <a href="/search/quant-ph?searchtype=author&query=Huber%2C+M">Marcus Huber</a>, <a href="/search/quant-ph?searchtype=author&query=Malik%2C+M">Mehul Malik</a>, <a href="/search/quant-ph?searchtype=author&query=Sinclair%2C+G+F">Gary F. Sinclair</a>, <a href="/search/quant-ph?searchtype=author&query=Zhou%2C+X">Xiaoqi Zhou</a>, <a href="/search/quant-ph?searchtype=author&query=Rottwitt%2C+K">Karsten Rottwitt</a>, <a href="/search/quant-ph?searchtype=author&query=Brien%2C+J+L+O">Jeremy L. O Brien</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Gong%2C+Q">Qihuang Gong</a>, <a href="/search/quant-ph?searchtype=author&query=Oxenlowe%2C+L+K">Leif K. Oxenlowe</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+J">Jianwei Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Thompson%2C+M+G">Mark G. Thompson</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1911.07839v2-abstract-short" style="display: inline;"> Exploiting semiconductor fabrication techniques, natural carriers of quantum information such as atoms, electrons, and photons can be embedded in scalable integrated devices. Integrated optics provides a versatile platform for large-scale quantum information processing and transceiving with photons. Scaling up the integrated devices for quantum applications requires highperformance single-photon g… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.07839v2-abstract-full').style.display = 'inline'; document.getElementById('1911.07839v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.07839v2-abstract-full" style="display: none;"> Exploiting semiconductor fabrication techniques, natural carriers of quantum information such as atoms, electrons, and photons can be embedded in scalable integrated devices. Integrated optics provides a versatile platform for large-scale quantum information processing and transceiving with photons. Scaling up the integrated devices for quantum applications requires highperformance single-photon generation and photonic qubit-qubit entangling operations. However, previous demonstrations report major challenges in producing multiple bright, pure and identical single-photons, and entangling multiple photonic qubits with high fidelity. Another notable challenge is to noiselessly interface multiphoton sources and multiqubit operators in a single device. Here we demonstrate on-chip genuine multipartite entanglement and quantum teleportation in silicon, by coherently controlling an integrated network of microresonator nonlinear single-photon sources and linear-optic multiqubit entangling circuits. The microresonators are engineered to locally enhance the nonlinearity, producing multiple frequencyuncorrelated and indistinguishable single-photons, without requiring any spectral filtering. The multiqubit states are processed in a programmable linear circuit facilitating Bell-projection and fusion operation in a measurement-based manner. We benchmark key functionalities, such as intra-/inter-chip teleportation of quantum states, and generation of four-photon Greenberger-HorneZeilinger entangled states. The production, control, and transceiving of states are all achieved in micrometer-scale silicon chips, fabricated by complementary metal-oxide-semiconductor processes. Our work lays the groundwork for scalable on-chip multiphoton technologies for quantum computing and communication. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.07839v2-abstract-full').style.display = 'none'; document.getElementById('1911.07839v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nat. Phys. 16, 148-153 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.00649">arXiv:1910.00649</a> <span> [<a href="https://arxiv.org/pdf/1910.00649">pdf</a>, <a href="https://arxiv.org/format/1910.00649">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1364/OE.27.020787">10.1364/OE.27.020787 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Localization-based two-photon wave-function information encoding </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Santagati%2C+R">Raffaele Santagati</a>, <a href="/search/quant-ph?searchtype=author&query=Price%2C+A+B">Alasdair B. Price</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Leonetti%2C+M">Marco Leonetti</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.00649v2-abstract-short" style="display: inline;"> In quantum communications, quantum states are employed for the transmission of information between remote parties. This usually requires sharing knowledge of the measurement bases through a classical public channel in the sifting phase of the protocol. Here, we demonstrate a quantum communication scheme where the information on the bases is shared "non-classically", by encoding this information… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.00649v2-abstract-full').style.display = 'inline'; document.getElementById('1910.00649v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.00649v2-abstract-full" style="display: none;"> In quantum communications, quantum states are employed for the transmission of information between remote parties. This usually requires sharing knowledge of the measurement bases through a classical public channel in the sifting phase of the protocol. Here, we demonstrate a quantum communication scheme where the information on the bases is shared "non-classically", by encoding this information in the same photons used for carrying the data. This enhanced capability is achieved by exploiting the localization of the photonic wave function, observed when the photons are prepared and measured in the same quantum basis. We experimentally implement our scheme by using a multi-mode optical fiber coupled to an adaptive optics setup. We observe a decrease in the error rate for higher dimensionality, indicating an improved resilience against noise. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.00649v2-abstract-full').style.display = 'none'; document.getElementById('1910.00649v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Opt. Express 27, 20787-20799 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.09383">arXiv:1909.09383</a> <span> [<a href="https://arxiv.org/pdf/1909.09383">pdf</a>, <a href="https://arxiv.org/format/1909.09383">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0002709">10.1063/5.0002709 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Single photon emission and single spin coherence of a nitrogen vacancy centre encapsulated in silicon nitride </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Smith%2C+J">Joe Smith</a>, <a href="/search/quant-ph?searchtype=author&query=Monroy-Ruz%2C+J">Jorge Monroy-Ruz</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Balram%2C+K+C">Krishna C. Balram</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1909.09383v2-abstract-short" style="display: inline;"> Finding the right material platform for engineering efficient photonic interfaces to solid state emitters has been a long-standing bottleneck for scaling up solid state quantum systems. In this work, we demonstrate that nitrogen-rich silicon nitride, with its low background auto-fluorescence at visible wavelengths, is a viable quantum photonics platform by showing that nitrogen vacancy centres emb… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.09383v2-abstract-full').style.display = 'inline'; document.getElementById('1909.09383v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.09383v2-abstract-full" style="display: none;"> Finding the right material platform for engineering efficient photonic interfaces to solid state emitters has been a long-standing bottleneck for scaling up solid state quantum systems. In this work, we demonstrate that nitrogen-rich silicon nitride, with its low background auto-fluorescence at visible wavelengths, is a viable quantum photonics platform by showing that nitrogen vacancy centres embedded in nanodiamonds preserve both their quantum optical and spin properties post-encapsulation. Given the variety of high-performance photonic components already demonstrated in silicon nitride, our work opens up a new avenue for building integrated photonic circuits using solid state emitters. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.09383v2-abstract-full').style.display = 'none'; document.getElementById('1909.09383v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 January, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures. Results unchanged, arguments revised</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Appl. Phys. Lett. 116, 134001 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.07530">arXiv:1909.07530</a> <span> [<a href="https://arxiv.org/pdf/1909.07530">pdf</a>, <a href="https://arxiv.org/format/1909.07530">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="History and Philosophy of Physics">physics.hist-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10701-021-00412-5">10.1007/s10701-021-00412-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> How Quantum is Quantum Counterfactual Communication? </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J+R">Jonte R. Hance</a>, <a href="/search/quant-ph?searchtype=author&query=Ladyman%2C+J">James Ladyman</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1909.07530v5-abstract-short" style="display: inline;"> Quantum Counterfactual Communication is the recently-proposed idea of using quantum physics to send messages between two parties, without any matter/energy transfer associated with the bits sent. While this has excited massive interest, both for potential `unhackable' communication, and insight into the foundations of quantum mechanics, it has been asked whether this process is essentially quantum… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.07530v5-abstract-full').style.display = 'inline'; document.getElementById('1909.07530v5-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.07530v5-abstract-full" style="display: none;"> Quantum Counterfactual Communication is the recently-proposed idea of using quantum physics to send messages between two parties, without any matter/energy transfer associated with the bits sent. While this has excited massive interest, both for potential `unhackable' communication, and insight into the foundations of quantum mechanics, it has been asked whether this process is essentially quantum, or could be performed classically. We examine counterfactual communication, both classical and quantum, and show that the protocols proposed so far for sending signals that don't involve matter/energy transfer associated with the bits sent must be quantum, insofar as they require wave-particle duality. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.07530v5-abstract-full').style.display = 'none'; document.getElementById('1909.07530v5-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3+5 pages, 5 figures; accepted for publication in Foundations of Physics</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">MSC Class:</span> 81P45; 81P05; 94A05; 81V80 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Foundations of Physics (2021) 51:12 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1908.08745">arXiv:1908.08745</a> <span> [<a href="https://arxiv.org/pdf/1908.08745">pdf</a>, <a href="https://arxiv.org/format/1908.08745">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1364/OPTICA.379679">10.1364/OPTICA.379679 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Chip-based measurement-device-independent quantum key distribution </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Semenenko%2C+H">Henry Semenenko</a>, <a href="/search/quant-ph?searchtype=author&query=Sibson%2C+P">Philip Sibson</a>, <a href="/search/quant-ph?searchtype=author&query=Hart%2C+A">Andy Hart</a>, <a href="/search/quant-ph?searchtype=author&query=Thompson%2C+M+G">Mark G. Thompson</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Erven%2C+C">Chris Erven</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1908.08745v2-abstract-short" style="display: inline;"> Modern communication strives towards provably secure systems which can be widely deployed. Quantum key distribution provides a methodology to verify the integrity and security of a key exchange based on physical laws. However, physical systems often fall short of theoretical models, meaning they can be compromised through uncharacterized side-channels. The complexity of detection means that the me… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.08745v2-abstract-full').style.display = 'inline'; document.getElementById('1908.08745v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1908.08745v2-abstract-full" style="display: none;"> Modern communication strives towards provably secure systems which can be widely deployed. Quantum key distribution provides a methodology to verify the integrity and security of a key exchange based on physical laws. However, physical systems often fall short of theoretical models, meaning they can be compromised through uncharacterized side-channels. The complexity of detection means that the measurement system is a vulnerable target for an adversary. Here, we present secure key exchange up to 200 km while removing all side-channels from the measurement system. We use mass-manufacturable, monolithically integrated transmitters that represent an accessible, quantum-ready communication platform. This work demonstrates a network topology that allows secure equipment sharing which is accessible with a cost-effective transmitter, significantly reducing the barrier for widespread uptake of quantum-secured communication. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1908.08745v2-abstract-full').style.display = 'none'; document.getElementById('1908.08745v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Optica 7 (3), 238-242 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.08229">arXiv:1907.08229</a> <span> [<a href="https://arxiv.org/pdf/1907.08229">pdf</a>, <a href="https://arxiv.org/format/1907.08229">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1126/sciadv.aba0959">10.1126/sciadv.aba0959 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A trusted-node-free eight-user metropolitan quantum communication network </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S+K">Siddarth Koduru Joshi</a>, <a href="/search/quant-ph?searchtype=author&query=Aktas%2C+D">Djeylan Aktas</a>, <a href="/search/quant-ph?searchtype=author&query=Wengerowsky%2C+S">S枚ren Wengerowsky</a>, <a href="/search/quant-ph?searchtype=author&query=Lon%C4%8Dari%C4%87%2C+M">Martin Lon膷ari膰</a>, <a href="/search/quant-ph?searchtype=author&query=Neumann%2C+S+P">Sebastian Philipp Neumann</a>, <a href="/search/quant-ph?searchtype=author&query=Liu%2C+B">Bo Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Scheidl%2C+T">Thomas Scheidl</a>, <a href="/search/quant-ph?searchtype=author&query=Curr%C3%A1s-Lorenzo%2C+G">Guillermo Curr谩s-Lorenzo</a>, <a href="/search/quant-ph?searchtype=author&query=Samec%2C+%C5%BD">沤eljko Samec</a>, <a href="/search/quant-ph?searchtype=author&query=Kling%2C+L">Laurent Kling</a>, <a href="/search/quant-ph?searchtype=author&query=Qiu%2C+A">Alex Qiu</a>, <a href="/search/quant-ph?searchtype=author&query=Razavi%2C+M">Mohsen Razavi</a>, <a href="/search/quant-ph?searchtype=author&query=Stip%C4%8Devi%C4%87%2C+M">Mario Stip膷evi膰</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Ursin%2C+R">Rupert Ursin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.08229v4-abstract-short" style="display: inline;"> Quantum communication is rapidly gaining popularity due to its high security and technological maturity. However, most implementations are limited to just two communicating parties (users). Quantum communication networks aim to connect a multitude of users. Here we present a fully connected quantum communication network on a city wide scale without active switching or trusted nodes. We demonstrate… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.08229v4-abstract-full').style.display = 'inline'; document.getElementById('1907.08229v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.08229v4-abstract-full" style="display: none;"> Quantum communication is rapidly gaining popularity due to its high security and technological maturity. However, most implementations are limited to just two communicating parties (users). Quantum communication networks aim to connect a multitude of users. Here we present a fully connected quantum communication network on a city wide scale without active switching or trusted nodes. We demonstrate simultaneous and secure connections between all 28 pairings of 8 users. Our novel network topology is easily scalable to many users, allows traffic management features and minimises the infrastructure as well as the user hardware needed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.08229v4-abstract-full').style.display = 'none'; document.getElementById('1907.08229v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 9 figures, 3 tables. Corrected typos, updated references</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science Advances 6, no. 36 (2020): eaba0959 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1906.10158">arXiv:1906.10158</a> <span> [<a href="https://arxiv.org/pdf/1906.10158">pdf</a>, <a href="https://arxiv.org/format/1906.10158">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1364/OE.386615">10.1364/OE.386615 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Mid-infrared quantum optics in silicon </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Rosenfeld%2C+L+M">Lawrence M. Rosenfeld</a>, <a href="/search/quant-ph?searchtype=author&query=Sulway%2C+D+A">Dominic A. Sulway</a>, <a href="/search/quant-ph?searchtype=author&query=Sinclair%2C+G+F">Gary F. Sinclair</a>, <a href="/search/quant-ph?searchtype=author&query=Anant%2C+V">Vikas Anant</a>, <a href="/search/quant-ph?searchtype=author&query=Thompson%2C+M+G">Mark G. Thompson</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Silverstone%2C+J+W">Joshua W. Silverstone</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1906.10158v2-abstract-short" style="display: inline;"> Applied quantum optics stands to revolutionise many aspects of information technology, provided performance can be maintained when scaled up. Silicon quantum photonics satisfies the scaling requirements of miniaturisation and manufacturability, but at 1.55 $渭$m it suffers from unacceptable linear and nonlinear loss. Here we show that, by translating silicon quantum photonics to the mid-infrared, a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.10158v2-abstract-full').style.display = 'inline'; document.getElementById('1906.10158v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1906.10158v2-abstract-full" style="display: none;"> Applied quantum optics stands to revolutionise many aspects of information technology, provided performance can be maintained when scaled up. Silicon quantum photonics satisfies the scaling requirements of miniaturisation and manufacturability, but at 1.55 $渭$m it suffers from unacceptable linear and nonlinear loss. Here we show that, by translating silicon quantum photonics to the mid-infrared, a new quantum optics platform is created which can simultaneously maximise manufacturability and miniaturisation, while minimising loss. We demonstrate the necessary platform components: photon-pair generation, single-photon detection, and high-visibility quantum interference, all at wavelengths beyond 2 $渭$m. Across various regimes, we observe a maximum net coincidence rate of 448 $\pm$ 12 Hz, a coincidence-to-accidental ratio of 25.7 $\pm$ 1.1, and, a net two photon quantum interference visibility of 0.993 $\pm$ 0.017. Mid-infrared silicon quantum photonics will bring new quantum applications within reach. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.10158v2-abstract-full').style.display = 'none'; document.getElementById('1906.10158v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 4 figures; revised figures, updated discussion in section 3, typos corrected, added reference</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1906.05331">arXiv:1906.05331</a> <span> [<a href="https://arxiv.org/pdf/1906.05331">pdf</a>, <a href="https://arxiv.org/format/1906.05331">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Twin-beam sub-shot-noise raster-scanning microscope with a hybrid detection scheme </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Sabines-Chesterking%2C+J">J. Sabines-Chesterking</a>, <a href="/search/quant-ph?searchtype=author&query=McMillan%2C+A+R">A. R. McMillan</a>, <a href="/search/quant-ph?searchtype=author&query=Moreau%2C+P+A">P. A. Moreau</a>, <a href="/search/quant-ph?searchtype=author&query=Joshi%2C+S+K">S. K. Joshi</a>, <a href="/search/quant-ph?searchtype=author&query=Knauer%2C+S">S. Knauer</a>, <a href="/search/quant-ph?searchtype=author&query=Johnston%2C+E">E. Johnston</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">J. G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Matthews%2C+J+C+F">J. C. F. Matthews</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1906.05331v1-abstract-short" style="display: inline;"> By exploiting the quantised nature of light, we demonstrate a sub-shot-noise scanning optical transmittance microscope. Our microscope demonstrates, with micron scale resolution, a factor of improvement in precision of 1.76(9) in transmittance estimation gained per probe photon relative to an optimal classical version at the same optical power. This would allow us to observe photosensitive samples… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.05331v1-abstract-full').style.display = 'inline'; document.getElementById('1906.05331v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1906.05331v1-abstract-full" style="display: none;"> By exploiting the quantised nature of light, we demonstrate a sub-shot-noise scanning optical transmittance microscope. Our microscope demonstrates, with micron scale resolution, a factor of improvement in precision of 1.76(9) in transmittance estimation gained per probe photon relative to an optimal classical version at the same optical power. This would allow us to observe photosensitive samples with nearly twice the precision,without sacrificing image resolution or increasing optical power to improve signal-to-noise ratio. Our setup uses correlated twin-beams produced by parametric down-conversion, and a hybrid detection scheme comprising photon-counting-based feed-forward and a highly efficient CCD camera. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.05331v1-abstract-full').style.display = 'none'; document.getElementById('1906.05331v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.08509">arXiv:1901.08509</a> <span> [<a href="https://arxiv.org/pdf/1901.08509">pdf</a>, <a href="https://arxiv.org/format/1901.08509">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1364/QIM.2019.T5A.50">10.1364/QIM.2019.T5A.50 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Modal, Truly Counterfactual Communication with On-Chip Demonstration Proposal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J">Jonte Hance</a>, <a href="/search/quant-ph?searchtype=author&query=McCutcheon%2C+W">Will McCutcheon</a>, <a href="/search/quant-ph?searchtype=author&query=Yard%2C+P">Patrick Yard</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.08509v1-abstract-short" style="display: inline;"> We formalize Salih et al's Counterfactual Communication Protocol (arXiv2018), which allows it not only to be used in with other modes than polarization, but also for interesting extensions (e.g. sending superpositions from Bob to Alice). </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.08509v1-abstract-full" style="display: none;"> We formalize Salih et al's Counterfactual Communication Protocol (arXiv2018), which allows it not only to be used in with other modes than polarization, but also for interesting extensions (e.g. sending superpositions from Bob to Alice). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.08509v1-abstract-full').style.display = 'none'; document.getElementById('1901.08509v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">2 pages, 1 figure. Conference paper, accepted for OSA QIM V</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Quantum Information and Measurement (QIM) V: Quantum Technologies, OSA Technical Digest (Optica Publishing Group, 2019), paper T5A.50 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.05986">arXiv:1808.05986</a> <span> [<a href="https://arxiv.org/pdf/1808.05986">pdf</a>, <a href="https://arxiv.org/format/1808.05986">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Optimal simultaneous measurements of incompatible observables of a single photon </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Dada%2C+A+C">Adetunmise C. Dada</a>, <a href="/search/quant-ph?searchtype=author&query=McCutcheon%2C+W">Will McCutcheon</a>, <a href="/search/quant-ph?searchtype=author&query=Andersson%2C+E">Erika Andersson</a>, <a href="/search/quant-ph?searchtype=author&query=Crickmore%2C+J">Jonathan Crickmore</a>, <a href="/search/quant-ph?searchtype=author&query=Puthoor%2C+I">Ittoop Puthoor</a>, <a href="/search/quant-ph?searchtype=author&query=Gerardot%2C+B+D">Brian D. Gerardot</a>, <a href="/search/quant-ph?searchtype=author&query=McMillan%2C+A">Alex McMillan</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Oulton%2C+R">Ruth Oulton</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1808.05986v1-abstract-short" style="display: inline;"> Joint or simultaneous measurements of non-commuting quantum observables are possible at the cost of increased unsharpness or measurement uncertainty. Many different criteria exist for defining what an "optimal" joint measurement is, with corresponding different tradeoff relations for the measurements. Understanding the limitations of such measurements is of fundamental interest and relevant for qu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.05986v1-abstract-full').style.display = 'inline'; document.getElementById('1808.05986v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.05986v1-abstract-full" style="display: none;"> Joint or simultaneous measurements of non-commuting quantum observables are possible at the cost of increased unsharpness or measurement uncertainty. Many different criteria exist for defining what an "optimal" joint measurement is, with corresponding different tradeoff relations for the measurements. Understanding the limitations of such measurements is of fundamental interest and relevant for quantum technology. Here, we experimentally test a tradeoff relation for the sharpness of qubit measurements, a relation which refers directly to the form of the measurement operators, rather than to errors in estimates. We perform the first optical implementation of the simplest possible optimal joint measurement, requiring less quantum resources than have previously often been employed. Using a heralded single-photon source, we demonstrate quantum-limited performance of the scheme on single quanta. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.05986v1-abstract-full').style.display = 'none'; document.getElementById('1808.05986v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1807.09753">arXiv:1807.09753</a> <span> [<a href="https://arxiv.org/pdf/1807.09753">pdf</a>, <a href="https://arxiv.org/format/1807.09753">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevX.9.021019">10.1103/PhysRevX.9.021019 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic-field-learning using a single electronic spin in diamond with one-photon-readout at room temperature </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Santagati%2C+R">Raffaele Santagati</a>, <a href="/search/quant-ph?searchtype=author&query=Gentile%2C+A+A">Antonio A. Gentile</a>, <a href="/search/quant-ph?searchtype=author&query=Knauer%2C+S">Sebastian Knauer</a>, <a href="/search/quant-ph?searchtype=author&query=Schmitt%2C+S">Simon Schmitt</a>, <a href="/search/quant-ph?searchtype=author&query=Paesani%2C+S">Stefano Paesani</a>, <a href="/search/quant-ph?searchtype=author&query=Granade%2C+C">Christopher Granade</a>, <a href="/search/quant-ph?searchtype=author&query=Wiebe%2C+N">Nathan Wiebe</a>, <a href="/search/quant-ph?searchtype=author&query=Osterkamp%2C+C">Christian Osterkamp</a>, <a href="/search/quant-ph?searchtype=author&query=McGuinness%2C+L+P">Liam P. McGuinness</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+J">Jianwei Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Thompson%2C+M+G">Mark G. Thompson</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J+G">John G. Rarity</a>, <a href="/search/quant-ph?searchtype=author&query=Jelezko%2C+F">Fedor Jelezko</a>, <a href="/search/quant-ph?searchtype=author&query=Laing%2C+A">Anthony Laing</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1807.09753v1-abstract-short" style="display: inline;"> Nitrogen-vacancy (NV) centres in diamond are appealing nano-scale quantum sensors for temperature, strain, electric fields and, most notably, for magnetic fields. However, the cryogenic temperatures required for low-noise single-shot readout that have enabled the most sensitive NV-magnetometry reported to date, are impractical for key applications, e.g. biological sensing. Overcoming the noisy rea… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.09753v1-abstract-full').style.display = 'inline'; document.getElementById('1807.09753v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1807.09753v1-abstract-full" style="display: none;"> Nitrogen-vacancy (NV) centres in diamond are appealing nano-scale quantum sensors for temperature, strain, electric fields and, most notably, for magnetic fields. However, the cryogenic temperatures required for low-noise single-shot readout that have enabled the most sensitive NV-magnetometry reported to date, are impractical for key applications, e.g. biological sensing. Overcoming the noisy readout at room-temperature has until now demanded repeated collection of fluorescent photons, which increases the time-cost of the procedure thus reducing its sensitivity. Here we show how machine learning can process the noisy readout of a single NV centre at room-temperature, requiring on average only one photon per algorithm step, to sense magnetic field strength with a precision comparable to those reported for cryogenic experiments. Analysing large data sets from NV centres in bulk diamond, we report absolute sensitivities of $60$ nT s$^{1/2}$ including initialisation, readout, and computational overheads. We show that dephasing times can be simultaneously estimated, and that time-dependent fields can be dynamically tracked at room temperature. Our results dramatically increase the practicality of early-term single spin sensors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.09753v1-abstract-full').style.display = 'none'; document.getElementById('1807.09753v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">including supplementary informations</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. X 9, 021019 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.01257">arXiv:1806.01257</a> <span> [<a href="https://arxiv.org/pdf/1806.01257">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41534-022-00564-w">10.1038/s41534-022-00564-w <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The laws of physics do not prohibit counterfactual communication </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Salih%2C+H">Hatim Salih</a>, <a href="/search/quant-ph?searchtype=author&query=McCutcheon%2C+W">Will McCutcheon</a>, <a href="/search/quant-ph?searchtype=author&query=Hance%2C+J">Jonte Hance</a>, <a href="/search/quant-ph?searchtype=author&query=Rarity%2C+J">John Rarity</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1806.01257v9-abstract-short" style="display: inline;"> It has been conjectured that counterfactual communication is impossible, even for post-selected quantum particles. We strongly challenge this by proposing precisely such a counterfactual scheme where -- unambiguously -- none of Alice's photons that correctly contribute to her information about Bob's message have been to Bob. We demonstrate counterfactuality experimentally by means of weak measurem… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.01257v9-abstract-full').style.display = 'inline'; document.getElementById('1806.01257v9-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.01257v9-abstract-full" style="display: none;"> It has been conjectured that counterfactual communication is impossible, even for post-selected quantum particles. We strongly challenge this by proposing precisely such a counterfactual scheme where -- unambiguously -- none of Alice's photons that correctly contribute to her information about Bob's message have been to Bob. We demonstrate counterfactuality experimentally by means of weak measurements, and conceptually using consistent histories -- thus simultaneously satisfying both criteria without loopholes. Importantly, the fidelity of Alice learning Bob's bit can be made arbitrarily close to unity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.01257v9-abstract-full').style.display = 'none'; document.getElementById('1806.01257v9-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Published in npj Quantum Information. Matches published version. 6 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> npj Quantum Inf 8, 60 (2022) </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Rarity%2C+J&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Rarity%2C+J&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Rarity%2C+J&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Rarity%2C+J&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </a> </li> </ul> </nav> <div class="is-hidden-tablet">  <span 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