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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <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/2411.13948">arXiv:2411.13948</a> <span> [<a href="https://arxiv.org/pdf/2411.13948">pdf</a>, <a href="https://arxiv.org/format/2411.13948">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 key distribution with imperfectly isolated devices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Sixto%2C+X">Xoel Sixto</a>, <a href="/search/quant-ph?searchtype=author&query=Navarrete%2C+%C3%81">脕lvaro Navarrete</a>, <a href="/search/quant-ph?searchtype=author&query=Pereira%2C+M">Margarida Pereira</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=Tamaki%2C+K">Kiyoshi Tamaki</a>, <a href="/search/quant-ph?searchtype=author&query=Curty%2C+M">Marcos Curty</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="2411.13948v1-abstract-short" style="display: inline;"> Most security proofs of quantum key distribution (QKD) assume that there is no unwanted information leakage about the state preparation process. However, this assumption is impossible to guarantee in practice, as QKD systems can leak information to the channel due to device imperfections or the active action of an eavesdropper. Here, we solve this pressing issue by introducing a security proof in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.13948v1-abstract-full').style.display = 'inline'; document.getElementById('2411.13948v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.13948v1-abstract-full" style="display: none;"> Most security proofs of quantum key distribution (QKD) assume that there is no unwanted information leakage about the state preparation process. However, this assumption is impossible to guarantee in practice, as QKD systems can leak information to the channel due to device imperfections or the active action of an eavesdropper. Here, we solve this pressing issue by introducing a security proof in the presence of information leakage from all state preparation settings for arguably the most popular QKD scheme, namely the decoy-state BB84 protocol. The proof requires minimal experimental characterization, as only a single parameter related to the isolation of the source needs to be determined, thus providing a clear path for bridging the gap between theory and practice. Moreover, if information about the state of the side channels is available, this can be readily incorporated into the analysis to further improve the resulting performance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.13948v1-abstract-full').style.display = 'none'; document.getElementById('2411.13948v1-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 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">18 pages, 10 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/2411.00709">arXiv:2411.00709</a> <span> [<a href="https://arxiv.org/pdf/2411.00709">pdf</a>, <a href="https://arxiv.org/format/2411.00709">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"> Intensity correlations in decoy-state BB84 quantum key distribution systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Trefilov%2C+D">Daniil Trefilov</a>, <a href="/search/quant-ph?searchtype=author&query=Sixto%2C+X">Xoel Sixto</a>, <a href="/search/quant-ph?searchtype=author&query=Zapatero%2C+V">V铆ctor Zapatero</a>, <a href="/search/quant-ph?searchtype=author&query=Huang%2C+A">Anqi Huang</a>, <a href="/search/quant-ph?searchtype=author&query=Curty%2C+M">Marcos Curty</a>, <a href="/search/quant-ph?searchtype=author&query=Makarov%2C+V">Vadim Makarov</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="2411.00709v1-abstract-short" style="display: inline;"> The decoy-state method is a prominent approach to enhance the performance of quantum key distribution (QKD) systems that operate with weak coherent laser sources. Due to the limited transmissivity of single photons in optical fiber, current experimental decoy-state QKD setups increase their secret key rate by raising the repetition rate of the transmitter. However, this usually leads to correlatio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.00709v1-abstract-full').style.display = 'inline'; document.getElementById('2411.00709v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.00709v1-abstract-full" style="display: none;"> The decoy-state method is a prominent approach to enhance the performance of quantum key distribution (QKD) systems that operate with weak coherent laser sources. Due to the limited transmissivity of single photons in optical fiber, current experimental decoy-state QKD setups increase their secret key rate by raising the repetition rate of the transmitter. However, this usually leads to correlations between subsequent optical pulses. This phenomenon leaks information about the encoding settings, including the intensities of the generated signals, which invalidates a basic premise of decoy-state QKD. Here we characterize intensity correlations between the emitted optical pulses in two industrial prototypes of decoy-state BB84 QKD systems and show that they significantly reduce the asymptotic key rate. In contrast to what has been conjectured, we experimentally confirm that the impact of higher-order correlations on the intensity of the generated signals can be much higher than that of nearest-neighbour correlations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.00709v1-abstract-full').style.display = 'none'; document.getElementById('2411.00709v1-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> 1 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">15 pages, 8 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.03562">arXiv:2304.03562</a> <span> [<a href="https://arxiv.org/pdf/2304.03562">pdf</a>, <a href="https://arxiv.org/format/2304.03562">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/10.1140/epjqt/s40507-023-00210-0">10.1140/epjqt/s40507-023-00210-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Secret key rate bounds for quantum key distribution with non-uniform phase randomization </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Sixto%2C+X">Xoel Sixto</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=Tamaki%2C+K">Kiyoshi Tamaki</a>, <a href="/search/quant-ph?searchtype=author&query=Curty%2C+M">Marcos Curty</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="2304.03562v1-abstract-short" style="display: inline;"> Decoy-state quantum key distribution (QKD) is undoubtedly the most efficient solution to handle multi-photon signals emitted by laser sources, and provides the same secret key rate scaling as ideal single-photon sources. It requires, however, that the phase of each emitted pulse is uniformly random. This might be difficult to guarantee in practice, due to inevitable device imperfections and/or the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.03562v1-abstract-full').style.display = 'inline'; document.getElementById('2304.03562v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.03562v1-abstract-full" style="display: none;"> Decoy-state quantum key distribution (QKD) is undoubtedly the most efficient solution to handle multi-photon signals emitted by laser sources, and provides the same secret key rate scaling as ideal single-photon sources. It requires, however, that the phase of each emitted pulse is uniformly random. This might be difficult to guarantee in practice, due to inevitable device imperfections and/or the use of an external phase modulator for phase randomization, which limits the possible selected phases to a finite set. Here, we investigate the security of decoy-state QKD with arbitrary, continuous or discrete, non-uniform phase randomization, and show that this technique is quite robust to deviations from the ideal uniformly random scenario. For this, we combine a novel parameter estimation technique based on semi-definite programming, with the use of basis mismatched events, to tightly estimate the parameters that determine the achievable secret key rate. In doing so, we demonstrate that our analysis can significantly outperform previous results that address more restricted scenarios. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.03562v1-abstract-full').style.display = 'none'; document.getElementById('2304.03562v1-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, 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">Journal ref:</span> EPJ Quantum Technol. 10, 53 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2206.06700">arXiv:2206.06700</a> <span> [<a href="https://arxiv.org/pdf/2206.06700">pdf</a>, <a href="https://arxiv.org/format/2206.06700">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/PhysRevApplied.18.044069">10.1103/PhysRevApplied.18.044069 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Security of decoy-state quantum key distribution with correlated intensity fluctuations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Sixto%2C+X">Xoel Sixto</a>, <a href="/search/quant-ph?searchtype=author&query=Zapatero%2C+V">V铆ctor Zapatero</a>, <a href="/search/quant-ph?searchtype=author&query=Curty%2C+M">Marcos Curty</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="2206.06700v2-abstract-short" style="display: inline;"> One of the most prominent techniques to enhance the performance of practical quantum key distribution (QKD) systems with laser sources is the decoy-state method. Current decoy-state QKD setups operate at GHz repetition rates, a regime where memory effects in the modulators and electronics that control them create correlations between the intensities of the emitted pulses. This translates into info… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.06700v2-abstract-full').style.display = 'inline'; document.getElementById('2206.06700v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2206.06700v2-abstract-full" style="display: none;"> One of the most prominent techniques to enhance the performance of practical quantum key distribution (QKD) systems with laser sources is the decoy-state method. Current decoy-state QKD setups operate at GHz repetition rates, a regime where memory effects in the modulators and electronics that control them create correlations between the intensities of the emitted pulses. This translates into information leakage about the selected intensities, which cripples a crucial premise of the decoy-state method, thus invalidating the use of standard security analyses. To overcome this problem, a novel security proof that exploits the Cauchy-Schwarz constraint has been introduced recently. Its main drawback is, however, that the achievable key rate is significantly lower than that of the ideal scenario without intensity correlations. Here, we improve this security proof technique by combining it with a fine-grained decoy-state analysis, which can deliver a tight estimation of the relevant parameters that determine the secret key rate. This results in a notable performance enhancement, being now the attainable distance double than that of previous analyses for certain parameter regimes. Also, we show that when the probability density function of the intensity fluctuations, conditioned on the current and previous intensity choices, is known, our approach provides a key rate very similar to the ideal scenario, which highlights the importance of an accurate experimental characterization of the correlations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.06700v2-abstract-full').style.display = 'none'; document.getElementById('2206.06700v2-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 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">19 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. 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