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The Reversibility Paradox: Role of the Velocity Reversal Step | International Journal of Theoretical Physics
<!DOCTYPE html> <html lang="en" class="no-js"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="applicable-device" content="pc,mobile"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="robots" content="max-image-preview:large"> <meta name="access" content="Yes"> <meta name="360-site-verification" content="1268d79b5e96aecf3ff2a7dac04ad990" /> <title>The Reversibility Paradox: Role of the Velocity Reversal Step | International Journal of Theoretical Physics</title> <meta name="twitter:site" content="@SpringerLink"/> <meta name="twitter:card" content="summary_large_image"/> <meta name="twitter:image:alt" content="Content cover image"/> <meta name="twitter:title" content="The Reversibility Paradox: Role of the Velocity Reversal Step"/> <meta name="twitter:description" content="International Journal of Theoretical Physics - The reversibility, or Loschmidt paradox, is a thought experiment in which microscopic reversibility is exploited to generate an apparently spontaneous..."/> <meta name="twitter:image" content="https://media.springernature.com/full/springer-static/cover-hires/journal/10773"/> <meta name="journal_id" content="10773"/> <meta name="dc.title" content="The Reversibility Paradox: Role of the Velocity Reversal Step"/> <meta name="dc.source" content="International Journal of Theoretical Physics 2023 62:9"/> <meta name="dc.format" content="text/html"/> <meta name="dc.publisher" content="Springer"/> <meta name="dc.date" content="2023-09-02"/> <meta name="dc.type" content="OriginalPaper"/> <meta name="dc.language" content="En"/> <meta name="dc.copyright" content="2023 The Author(s)"/> <meta name="dc.rights" content="2023 The Author(s)"/> <meta name="dc.rightsAgent" content="journalpermissions@springernature.com"/> <meta name="dc.description" content="The reversibility, or Loschmidt paradox, is a thought experiment in which microscopic reversibility is exploited to generate an apparently spontaneous trajectory in which entropy decreases, thus violating the Second Law of Thermodynamics (SLT). To achieve this, the system is allowed to evolve from a low-entropy to a high-entropy configuration, at which point all velocities of its molecules are reversed, thus producing the desired effect. In this paper we focus on the velocity reversal step. Implementing this step requires the measurement of velocities and positions, which must be stored in a memory. Even in the case of a reversible measurement, the erasure of the stored information, necessary to reset the measuring device to its original state, has an entropy cost that offsets the entropy decrease during the reverse evolution of the system. This cost is sufficient to explain why the described procedure does not violate the SLT."/> <meta name="prism.issn" content="1572-9575"/> <meta name="prism.publicationName" content="International Journal of Theoretical Physics"/> <meta name="prism.publicationDate" content="2023-09-02"/> <meta name="prism.volume" content="62"/> <meta name="prism.number" content="9"/> <meta name="prism.section" content="OriginalPaper"/> <meta name="prism.startingPage" content="1"/> <meta name="prism.endingPage" content="5"/> <meta name="prism.copyright" content="2023 The Author(s)"/> <meta name="prism.rightsAgent" content="journalpermissions@springernature.com"/> <meta name="prism.url" content="https://link.springer.com/article/10.1007/s10773-023-05458-x"/> <meta name="prism.doi" content="doi:10.1007/s10773-023-05458-x"/> <meta name="citation_pdf_url" content="https://link.springer.com/content/pdf/10.1007/s10773-023-05458-x.pdf"/> <meta name="citation_fulltext_html_url" content="https://link.springer.com/article/10.1007/s10773-023-05458-x"/> <meta name="citation_journal_title" content="International Journal of Theoretical Physics"/> <meta name="citation_journal_abbrev" content="Int J Theor Phys"/> <meta name="citation_publisher" content="Springer US"/> <meta name="citation_issn" content="1572-9575"/> <meta name="citation_title" content="The Reversibility Paradox: Role of the Velocity Reversal Step"/> <meta name="citation_volume" content="62"/> <meta name="citation_issue" content="9"/> <meta name="citation_publication_date" content="2023/09"/> <meta name="citation_online_date" content="2023/09/02"/> <meta name="citation_firstpage" content="1"/> <meta name="citation_lastpage" content="5"/> <meta name="citation_article_type" content="Research"/> <meta name="citation_fulltext_world_readable" content=""/> <meta name="citation_language" content="en"/> <meta name="dc.identifier" content="doi:10.1007/s10773-023-05458-x"/> <meta name="DOI" content="10.1007/s10773-023-05458-x"/> <meta name="size" content="47598"/> <meta name="citation_doi" content="10.1007/s10773-023-05458-x"/> <meta name="citation_springer_api_url" content="http://api.springer.com/xmldata/jats?q=doi:10.1007/s10773-023-05458-x&api_key="/> <meta name="description" content="The reversibility, or Loschmidt paradox, is a thought experiment in which microscopic reversibility is exploited to generate an apparently spontaneous traj"/> <meta name="dc.creator" content="Binder, P.M."/> <meta name="dc.subject" content="Physics, general"/> <meta name="dc.subject" content="Quantum Physics"/> <meta name="dc.subject" content="Elementary Particles, Quantum Field Theory"/> <meta name="dc.subject" content="Theoretical, Mathematical and Computational Physics"/> <meta name="citation_reference" content="citation_title=The Kind of Motion We Call Heat; citation_publication_date=1976; citation_id=CR1; citation_author=SG Brush; citation_publisher=North-Holland"/> <meta name="citation_reference" content="citation_title=Physics and Chance; citation_publication_date=1993; citation_id=CR2; citation_author=L Sklar; citation_publisher=Cambridge University Press"/> <meta name="citation_reference" content="citation_journal_title=Phys. 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To achieve this, the system is allowed to evolve from a low-entropy to a high-entropy configuration, at which point all velocities of its molecules are reversed, thus producing the desired effect. In this paper we focus on the velocity reversal step. Implementing this step requires the measurement of velocities and positions, which must be stored in a memory. Even in the case of a reversible measurement, the erasure of the stored information, necessary to reset the measuring device to its original state, has an entropy cost that offsets the entropy decrease during the reverse evolution of the system. This cost is sufficient to explain why the described procedure does not violate the SLT."/> <meta property="og:image" content="https://media.springernature.com/full/springer-static/cover-hires/journal/10773"/> <meta name="format-detection" content="telephone=no"> <link rel="apple-touch-icon" sizes="180x180" href=/oscar-static/img/favicons/darwin/apple-touch-icon-92e819bf8a.png> <link rel="icon" type="image/png" sizes="192x192" href=/oscar-static/img/favicons/darwin/android-chrome-192x192-6f081ca7e5.png> <link rel="icon" type="image/png" sizes="32x32" href=/oscar-static/img/favicons/darwin/favicon-32x32-1435da3e82.png> <link rel="icon" type="image/png" sizes="16x16" href=/oscar-static/img/favicons/darwin/favicon-16x16-ed57f42bd2.png> <link rel="shortcut icon" data-test="shortcut-icon" href=/oscar-static/img/favicons/darwin/favicon-c6d59aafac.ico> <meta name="theme-color" content="#e6e6e6"> <!-- Please see discussion: https://github.com/springernature/frontend-open-space/issues/316--> 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To achieve this, the system is allowed to evolve from a low-entropy to a high-entropy configuration, at which point all velocities of its molecules are reversed, thus producing the desired effect. In this paper we focus on the velocity reversal step. Implementing this step requires the measurement of velocities and positions, which must be stored in a memory. Even in the case of a reversible measurement, the erasure of the stored information, necessary to reset the measuring device to its original state, has an entropy cost that offsets the entropy decrease during the reverse evolution of the system. This cost is sufficient to explain why the described procedure does not violate the SLT.","datePublished":"2023-09-02T00:00:00Z","dateModified":"2023-09-02T00:00:00Z","pageStart":"1","pageEnd":"5","license":"http://creativecommons.org/licenses/by/4.0/","sameAs":"https://doi.org/10.1007/s10773-023-05458-x","keywords":["Foundations of physics","History of science","Loschmidt paradox","Landauer’s principle","Maxwell’s demon","Second Law of Thermodynamics","Physics","general","Quantum Physics","Elementary Particles","Quantum Field Theory","Theoretical","Mathematical and Computational Physics"],"image":[],"isPartOf":{"name":"International Journal of Theoretical Physics","issn":["1572-9575"],"volumeNumber":"62","@type":["Periodical","PublicationVolume"]},"publisher":{"name":"Springer US","logo":{"url":"https://www.springernature.com/app-sn/public/images/logo-springernature.png","@type":"ImageObject"},"@type":"Organization"},"author":[{"name":"P.M. 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class="c-context-bar__title"> The Reversibility Paradox: Role of the Velocity Reversal Step </div> <div data-test="inCoD" data-track-context="sticky banner"> <div class="c-pdf-container"> <div class="c-pdf-download u-clear-both u-mb-16"> <a href="/content/pdf/10.1007/s10773-023-05458-x.pdf" class="u-button u-button--full-width u-button--primary u-justify-content-space-between c-pdf-download__link" data-article-pdf="true" data-readcube-pdf-url="true" data-test="pdf-link" data-draft-ignore="true" data-track="content_download" data-track-type="article pdf download" data-track-action="download pdf" data-track-label="button" data-track-external download> <span class="c-pdf-download__text">Download PDF</span> <svg aria-hidden="true" focusable="false" width="16" height="16" class="u-icon"><use xlink:href="#icon-eds-i-download-medium"/></svg> </a> </div> </div> </div> </div> </div> <div class="c-article-header"> <header> <ul class="c-article-author-list c-article-author-list--short" 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Binder<svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-mail-medium"></use></svg></a><span class="u-js-hide"> <a class="js-orcid" href="http://orcid.org/0000-0001-5242-6319"><span class="u-visually-hidden">ORCID: </span>orcid.org/0000-0001-5242-6319</a></span><sup class="u-js-hide"><a href="#Aff1">1</a></sup> </li></ul> <div data-test="article-metrics"> <ul class="app-article-metrics-bar u-list-reset"> <li class="app-article-metrics-bar__item"> <p class="app-article-metrics-bar__count"><svg class="u-icon app-article-metrics-bar__icon" width="24" height="24" aria-hidden="true" focusable="false"> <use xlink:href="#icon-eds-i-accesses-medium"></use> </svg>1722 <span class="app-article-metrics-bar__label">Accesses</span></p> </li> <li class="app-article-metrics-bar__item"> <p class="app-article-metrics-bar__count"><svg class="u-icon app-article-metrics-bar__icon" width="24" height="24" aria-hidden="true" focusable="false"> <use xlink:href="#icon-eds-i-citations-medium"></use> </svg>2 <span class="app-article-metrics-bar__label">Citations</span></p> </li> <li class="app-article-metrics-bar__item"> <p class="app-article-metrics-bar__count"><svg class="u-icon app-article-metrics-bar__icon" width="24" height="24" aria-hidden="true" focusable="false"> <use xlink:href="#icon-eds-i-altmetric-medium"></use> </svg>5 <span class="app-article-metrics-bar__label">Altmetric</span></p> </li> <li class="app-article-metrics-bar__item app-article-metrics-bar__item--metrics"> <p class="app-article-metrics-bar__details"><a href="/article/10.1007/s10773-023-05458-x/metrics" data-track="click" data-track-action="view metrics" data-track-label="link" rel="nofollow">Explore all metrics <svg class="u-icon app-article-metrics-bar__arrow-icon" width="24" height="24" aria-hidden="true" focusable="false"> <use xlink:href="#icon-eds-i-arrow-right-medium"></use> </svg></a></p> </li> </ul> </div> <div class="u-mt-32"> </div> </header> </div> <div data-article-body="true" data-track-component="article body" class="c-article-body"> <section aria-labelledby="Abs1" data-title="Abstract" lang="en"><div class="c-article-section" id="Abs1-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Abs1">Abstract</h2><div class="c-article-section__content" id="Abs1-content"><p>The reversibility, or Loschmidt paradox, is a thought experiment in which microscopic reversibility is exploited to generate an apparently spontaneous trajectory in which entropy decreases, thus violating the Second Law of Thermodynamics (SLT). To achieve this, the system is allowed to evolve from a low-entropy to a high-entropy configuration, at which point all velocities of its molecules are reversed, thus producing the desired effect. In this paper we focus on the velocity reversal step. Implementing this step requires the measurement of velocities and positions, which must be stored in a memory. Even in the case of a reversible measurement, the erasure of the stored information, necessary to reset the measuring device to its original state, has an entropy cost that offsets the entropy decrease during the reverse evolution of the system. This cost is sufficient to explain why the described procedure does not violate the SLT.</p></div></div></section> <div data-test="cobranding-download"> </div> <section aria-labelledby="inline-recommendations" data-title="Inline Recommendations" class="c-article-recommendations" data-track-component="inline-recommendations"> <h3 class="c-article-recommendations-title" id="inline-recommendations">Similar content being viewed by others</h3> <div class="c-article-recommendations-list"> <div class="c-article-recommendations-list__item"> <article class="c-article-recommendations-card" itemscope itemtype="http://schema.org/ScholarlyArticle"> <div class="c-article-recommendations-card__img"><img src="https://media.springernature.com/w215h120/springer-static/image/art%3Aplaceholder%2Fimages/placeholder-figure-nature.png" loading="lazy" alt=""></div> <div class="c-article-recommendations-card__main"> <h3 class="c-article-recommendations-card__heading" itemprop="name headline"> <a class="c-article-recommendations-card__link" itemprop="url" href="https://link.springer.com/10.1038/s42005-020-00396-0?fromPaywallRec=false" data-track="select_recommendations_1" data-track-context="inline recommendations" data-track-action="click recommendations inline - 1" data-track-label="10.1038/s42005-020-00396-0">Time-reversal of an unknown quantum state </a> </h3> <div class="c-article-meta-recommendations" data-test="recommendation-info"> <span class="c-article-meta-recommendations__item-type">Article</span> <span class="c-article-meta-recommendations__access-type">Open access</span> <span class="c-article-meta-recommendations__date">21 July 2020</span> </div> </div> </article> </div> <div class="c-article-recommendations-list__item"> <article class="c-article-recommendations-card" itemscope itemtype="http://schema.org/ScholarlyArticle"> <div class="c-article-recommendations-card__img"><img src="https://media.springernature.com/w215h120/springer-static/image/art%3A10.1007%2Fs10701-015-9871-z/MediaObjects/10701_2015_9871_Fig1_HTML.gif" loading="lazy" alt=""></div> <div class="c-article-recommendations-card__main"> <h3 class="c-article-recommendations-card__heading" itemprop="name headline"> <a class="c-article-recommendations-card__link" itemprop="url" href="https://link.springer.com/10.1007/s10701-015-9871-z?fromPaywallRec=false" data-track="select_recommendations_2" data-track-context="inline recommendations" data-track-action="click recommendations inline - 2" data-track-label="10.1007/s10701-015-9871-z">Lanford’s Theorem and the Emergence of Irreversibility </a> </h3> <div class="c-article-meta-recommendations" data-test="recommendation-info"> <span class="c-article-meta-recommendations__item-type">Article</span> <span class="c-article-meta-recommendations__date">19 February 2015</span> </div> </div> </article> </div> <div class="c-article-recommendations-list__item"> <article class="c-article-recommendations-card" itemscope itemtype="http://schema.org/ScholarlyArticle"> <div class="c-article-recommendations-card__img"><img src="https://media.springernature.com/w215h120/springer-static/image/art%3A10.1007%2Fs10701-022-00557-x/MediaObjects/10701_2022_557_Fig1_HTML.png" loading="lazy" alt=""></div> <div class="c-article-recommendations-card__main"> <h3 class="c-article-recommendations-card__heading" itemprop="name headline"> <a class="c-article-recommendations-card__link" itemprop="url" href="https://link.springer.com/10.1007/s10701-022-00557-x?fromPaywallRec=false" data-track="select_recommendations_3" data-track-context="inline recommendations" data-track-action="click recommendations inline - 3" data-track-label="10.1007/s10701-022-00557-x">The Time-Identity Tradeoff </a> </h3> <div class="c-article-meta-recommendations" data-test="recommendation-info"> <span class="c-article-meta-recommendations__item-type">Article</span> <span class="c-article-meta-recommendations__date">10 March 2022</span> </div> </div> </article> </div> </div> </section> <script> window.dataLayer = window.dataLayer || []; window.dataLayer.push({ recommendations: { recommender: 'semantic', model: 'specter', policy_id: 'NA', timestamp: 1732305800, embedded_user: 'null' } }); </script> <div class="app-card-service" data-test="article-checklist-banner"> <div> <a class="app-card-service__link" data-track="click_presubmission_checklist" data-track-context="article page top of reading companion" data-track-category="pre-submission-checklist" data-track-action="clicked article page checklist banner test 2 old version" data-track-label="link" href="https://beta.springernature.com/pre-submission?journalId=10773" data-test="article-checklist-banner-link"> <span class="app-card-service__link-text">Use our pre-submission checklist</span> <svg class="app-card-service__link-icon" aria-hidden="true" focusable="false"><use xlink:href="#icon-eds-i-arrow-right-small"></use></svg> </a> <p class="app-card-service__description">Avoid common mistakes on your manuscript.</p> </div> <div class="app-card-service__icon-container"> <svg class="app-card-service__icon" aria-hidden="true" focusable="false"> <use xlink:href="#icon-eds-i-clipboard-check-medium"></use> </svg> </div> </div> <div class="main-content"> <section data-title="Introduction"><div class="c-article-section" id="Sec1-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Sec1"><span class="c-article-section__title-number">1 </span>Introduction</h2><div class="c-article-section__content" id="Sec1-content"><p>The purpose of this paper is to re-examine the reversibility paradox (RP), related to the Second Law of Thermodynamics (SLT), using modern developments in the physics of measurement and information. From this perspective we produce an account of the paradox that is sufficient to explain it: a step in the procedure of the paradox requires a measurement with an eventual entropy cost that offsets the entropy decrease one can achieve in a different step, thus avoiding a violation of the SLT.</p><p>The RP was formulated in the 1860s in the context of the infancy of kinetic theory. A complete, well-documented early history is presented in [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 1" title="Brush, S.G.: The Kind of Motion We Call Heat. North-Holland, Amsterdam (1976)" href="/article/10.1007/s10773-023-05458-x#ref-CR1" id="ref-link-section-d40198907e336">1</a>]. The initial formulation was made during discussions between Maxwell, Tait and Thompson (Lord Kelvin). It states that, if a system starts in a highly ordered state and one allows it to approach equilibrium, one can then simply at some point reverse the velocities of all its particles and thus produce a trajectory for which the entropy decreases, and therefore violate the SLT. The argument was independently formulated by Loschmidt in the 1870s and became known to Boltzmann. Brush [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 1" title="Brush, S.G.: The Kind of Motion We Call Heat. North-Holland, Amsterdam (1976)" href="/article/10.1007/s10773-023-05458-x#ref-CR1" id="ref-link-section-d40198907e339">1</a>] credits Loschmidt with motivating Boltzmann into formulating his H-theorem in terms of probabilities. It is precisely the velocity reversal step that this paper concentrates on.</p><p>In Sect. <a data-track="click" data-track-label="link" data-track-action="section anchor" href="/article/10.1007/s10773-023-05458-x#Sec2">2</a> we review some of the best-known resolutions of the RP. In Sect. <a data-track="click" data-track-label="link" data-track-action="section anchor" href="/article/10.1007/s10773-023-05458-x#Sec3">3</a> we look in more detail at the velocity reversal step, introduce elements from the modern theory of information and measurement, and recast the RP in such terms. All this results in a new understanding of the paradox. We discuss the findings in Sect. <a data-track="click" data-track-label="link" data-track-action="section anchor" href="/article/10.1007/s10773-023-05458-x#Sec4">4</a>.</p></div></div></section><section data-title="Previous Explanations of the Paradox"><div class="c-article-section" id="Sec2-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Sec2"><span class="c-article-section__title-number">2 </span>Previous Explanations of the Paradox</h2><div class="c-article-section__content" id="Sec2-content"><p>The point of the paradox is that one can construct processes that violate the SLT using an apparently simple reversal of velocities under the existence of reversible dynamics. This section describes previous explanations or resolutions of the paradox.</p><p>In the late 1800s it was argued that, since most available states in equilibrium have high entropy, encountering a configuration that evolved to a low-entropy state is statistically improbable [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 1" title="Brush, S.G.: The Kind of Motion We Call Heat. North-Holland, Amsterdam (1976)" href="/article/10.1007/s10773-023-05458-x#ref-CR1" id="ref-link-section-d40198907e365">1</a>]. More recent improbability argument address either the relatively small number of low-entropy initial conditions [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 2" title="Sklar, L.: Physics and Chance. Cambridge University Press, Cambridge (1993)" href="/article/10.1007/s10773-023-05458-x#ref-CR2" id="ref-link-section-d40198907e368">2</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 3" title="Holian, B.L., Hoover, W.G., Posch, H.A.: Resolution of the Loschmidt paradox: The origin of irreversible behavior in reversible atomistic dynamics. Phys. Rev. Lett. 59, 10–13 (1987)" href="/article/10.1007/s10773-023-05458-x#ref-CR3" id="ref-link-section-d40198907e371">3</a>] or the rarity of trajectories in which entropy decreases [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 4" title="Evans, D.J., Searles, D.J.: The fluctuation theorem. Adv. Phys. 51, 1529–1585 (2002)" href="/article/10.1007/s10773-023-05458-x#ref-CR4" id="ref-link-section-d40198907e374">4</a>]. Note that such arguments do not explain the RP – they just make its implementation rather improbable. Similarly, we see sensitive dependence on initial conditions arguments as moot, since one can at least conceptually reverse velocities exactly. Even if not, a reversed trajectory in which entropy decreases should be feasible at least for short times, thus still violating the SLT.</p><p>A different current of thought is that microscopic reversibility and macroscopic irreversibility are not incompatible. Swendsen [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 5" title="Swendsen, R.H.: Explaining irreversibility. Am. J. Phys. 76, 643–648 (2008)" href="/article/10.1007/s10773-023-05458-x#ref-CR5" id="ref-link-section-d40198907e380">5</a>] has studied the case of free expansion of noninteracting particles, initially confined in a small volume, and with velocities following a Maxwell-Boltzmann distribution, into a large container with perfectly reflecting walls. He developed an exact solution for the 1D case, and showed that, while the dynamics is reversible, it mimics the irreversible approach to equilibrium one expects as the particles spread into the larger box. Lebowitz [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 6" title="Lebowitz, J.L.: Microscopic origins of macroscopic irreversible behavior. Phys. A. 263, 516–527 (1999)" href="/article/10.1007/s10773-023-05458-x#ref-CR6" id="ref-link-section-d40198907e383">6</a>] has also stated that the paradox can be explained with three ingredients: a large separation of scales, the role of initial conditions, and probabilistic reasoning (not every state of a system evolves according to the SLT – only most of them).</p><p>Now, consider two scenarios. (1) A highly ordered macrostate is prepared (e.g., by non-adiabatic compression) and allowed to relax to a higher entropy state. Then the velocities are reversed, and the system comes back (close) to the initial microstate – not just macrostate. The velocity reversal step requires gaining a lot of knowledge about the system that we initially did not have. For the initial evolution we can at best offer a coarse-grained description, within which transitions from state to state are probabilistic. For the entire reversed evolution, we know “everything” about the system – not just its coarse-grained macroscopic configuration. (2) A highly ordered microstate is prepared, allowed to evolve to a state of higher entropy (as specified above); the velocities are reversed, and the system traces back its earlier evolution (close) to the initial microstate. This is allowed due to the reversibility of the system; in this case there is no paradox whatsoever. In scenario (1), however, a potential confusion arises due to the switch between the macro and a micro descriptions, which can be at the root of a misunderstanding of the paradox, as was pointed out almost 50 years ago [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 7" title="Rothstein, J.: Loschmidt’s and Zermelo’s paradoxes do not exist. Found. Phys. 4, 83–89 (1974)" href="/article/10.1007/s10773-023-05458-x#ref-CR7" id="ref-link-section-d40198907e389">7</a>]. In both cases I have included the specification “close to,” in order to accommodate the earlier point about sensitive dependence.</p></div></div></section><section data-title="Measurement, Erasure, Information, and Entropy"><div class="c-article-section" id="Sec3-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Sec3"><span class="c-article-section__title-number">3 </span>Measurement, Erasure, Information, and Entropy</h2><div class="c-article-section__content" id="Sec3-content"><p>The SLT is formulated for closed systems; it is time to look at the only step in the RP where the system is open to its environment: the velocity reversal step.</p><p>In order to determine the velocities and positions of the particle components of the system, measurements have to been made by some agent so that, for example, mirror-like barriers can be placed at the appropriate positions and angles so that the particles can indeed reverse their velocities. This has already been noticed by Zurek [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 8" title="Zurek, W.H.: Reversibility and stability of information processing systems. Phys. Rev. Lett. 53, 391–394 (1984)" href="/article/10.1007/s10773-023-05458-x#ref-CR8" id="ref-link-section-d40198907e403">8</a>]. We will call this agent generically a “Laplace demon.” As part of the measurement process, a record is written in its memory.</p><p>The all-knowing demon (“une vaste intelligence”) proposed by Laplace in a different context [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 9" title="De Laplace, P.S.: Philosophical Essay on Probabilities. Dover, New York (1951). Translated from the 1814 French original by Truscott, F. W., Emory, F. L" href="/article/10.1007/s10773-023-05458-x#ref-CR9" id="ref-link-section-d40198907e409">9</a>] shares some features with the better-known Maxwell’s demon [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 10" title="Leff, H.S., Rex, A.F. (eds.): Maxwell’s Demon. Princeton University Press, Princeton, USA (2014)" href="/article/10.1007/s10773-023-05458-x#ref-CR10" id="ref-link-section-d40198907e412">10</a>]. They both collect information about a system, store it in their memory, take subsequent actions that can presumably violate the SLT, and will either affect their environment during the measurement process, or need to have their memory reset at some point.</p><p>The Maxwell’s demon operates a trap between two containers so that it concentrates the faster particles in one of the containers. This creates a lower-entropy state that violates the SLT at no apparent cost. After 150 years of discussion in the literature, Bennett [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 11" title="Bennett, C.H.: The thermodynamics of computation – a review. Int. J. Theor. Phys. 21, 905–940 (1982)" href="/article/10.1007/s10773-023-05458-x#ref-CR11" id="ref-link-section-d40198907e418">11</a>] proposed a solution for why the SLT is not violated after all. It invokes Landauer’s principle [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 12" title="Landauer, R.: Reversibility and heat generation in the computing process. IBM J. Res. Develop. 5, 183–191 (1961)" href="/article/10.1007/s10773-023-05458-x#ref-CR12" id="ref-link-section-d40198907e421">12</a>], which states that during irreversible operations such as memory erasure the entropy in non-information bearing degrees of freedom in the demon or its environment must increase. Landauer’s principle has been recently verified experimentally [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="Bérut, A., Arakelyan, A., Petrosyan, A., Ciliberto, S., Dillenschneider, R., Lutz, E.: Experimental verification of Landauer’s principle linking information and thermodynamics. Nature. 483, 187–189 (2012)" href="#ref-CR13" id="ref-link-section-d40198907e424">13</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" title="Jun, Y., Gavrilov, M., Bechhoeffer, J.: High-precision test of Landauer’s principle in a feedback trap. Phys. Rev. Lett. 113, 190601 (2014)" href="#ref-CR14" id="ref-link-section-d40198907e424_1">14</a>,<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 15" title="Hong, J., Lambson, B., Dhuey, S., Bokor, J.: Experimental test of Landauer’s principle in single-bit operations on nanomagnetic memory bits. Sci. Adv. 2, e1501492 (2016)" href="/article/10.1007/s10773-023-05458-x#ref-CR15" id="ref-link-section-d40198907e427">15</a>] in a variety of physical systems. This principle is an extension of an earlier discovery by Szilard [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 16" title="Szilard, L.: Über die Entropieverminderung in einem thermodynamischen System bei Eingriffen intelligenter Wesen. Zeit Phys. 53, 840–856 (1929)" href="/article/10.1007/s10773-023-05458-x#ref-CR16" id="ref-link-section-d40198907e430">16</a>, <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 17" title="Toyabe, S., Sagawa, T., Ueda, M., Muneyuki, E., Sano, M.: Information heat engine: Converting information to energy by feedback control. Nat. Phys. 6, 988–992 (2010)" href="/article/10.1007/s10773-023-05458-x#ref-CR17" id="ref-link-section-d40198907e434">17</a>] that erasing a measurement has a thermodynamic cost, but which now has been extended to apply to irreversible measurements.</p><p>To elaborate on the above: following [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 11" title="Bennett, C.H.: The thermodynamics of computation – a review. Int. J. Theor. Phys. 21, 905–940 (1982)" href="/article/10.1007/s10773-023-05458-x#ref-CR11" id="ref-link-section-d40198907e441">11</a>], a Maxwell’s demon can potentially perform either irreversible or reversible measurements. In the first case, the measurement of each bit of information will require the generation of at least <i>k</i> ln <i>2</i> of entropy, thus avoiding a violation of the SLT. A reversible measurement requires a standard state for the bits where the measurement will be recorded, so that no previous information is overwritten. Then, the irreversible step is not the measurement, but instead the erasure, or resetting of the memory to the standard state. This is where Landauer’s principle comes in.</p><p>Thus, in order to restore the demon (Maxwell’s or Laplace’s) to its original state after a reversible measurement, there is an entropy cost, which offsets the decrease in entropy in the system as it follows its reverse path. In the RP scenario, the SLT therefore, still holds. As an example, for <i>N</i> monatomic particles and 20 bits per coordinate, the required entropy increase is <i>120Nk</i> ln <i>2.</i> The decrease of entropy in the reverse trajectory is bounded from above by this number, and will usually be less, depending on the level of coarse-graining of the system used to calculate the entropy.</p></div></div></section><section data-title="Discussion and Conclusions"><div class="c-article-section" id="Sec4-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Sec4"><span class="c-article-section__title-number">4 </span>Discussion and Conclusions</h2><div class="c-article-section__content" id="Sec4-content"><p>The SLT is valid for closed systems. In this paper we have shown that in the standard formulation of the Reversibility Paradox, the system in question must interact, even if for a brief time, with a measuring device. There is an ensuing transfer of information that, either is irreversible, or in order to satisfy the constraints of the SLT of no changes in the environment, needs to be reset. The last step has an entropy cost that offsets the decrease of entropy resulting from the reversed trajectory. Thus, the SLT is not violated. The resolution of the paradox presented here closely mirrors that of the Maxwell’s demon offered by Bennett. While this explanation does not challenge the vast effort in going from microscopic to macroscopic descriptions of physical systems, it simply suggests that this machinery is not the way to explain the reversibility paradox.</p><p>To reinforce the argument, consider any ideal gas process in which the entropy of the gas decreases – for example, an isothermal compression. This decrease is legitimate, as long as there is an equal, or greater increase of entropy somewhere else (e.g., one, or multiple thermal reservoirs) so that the overall entropy of the closed system (gas + reservoir) does not decrease. The set-up of the RP is no different, although it contains an illusion. Our sight is directed to the forward and backwards “closed” evolution, while misdirecting us from the crucial interaction with the environment that protects the integrity of the SLT through a sequence of measurement, information storage, and erasure with an entropy increase through Landauer’s principle, if needed. None of this was known in the 1800s, but as was done with Maxwell’s demon 40 years ago, the complete story can now be told. The other two paradoxes from that time, Gibbs’ and the recurrence paradox, never involve opening the system to an external agent and hence their resolutions are totally different.</p><p>The final remark comes in the context that I have written this paper thinking about classical gases, which were familiar to scientists in the 1800s. By now, a real-life Maxwell’s demon has been implemented in a laser cooling experiment [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 18" title="Raizen, M.G.: Comprehensive control of atomic motion. Science. 324, 1403–1406 (2009)" href="/article/10.1007/s10773-023-05458-x#ref-CR18" id="ref-link-section-d40198907e476">18</a>], in which ultracold atoms confined by magnetic traps are isolated with the use of carefully tuned laser beams. In this set-up, scattered photons, one per atom, carry information about the turning point and energy of each atom, thus constituting the memory. As these photons are absorbed far away from the set-up with possible re-emission of other photons uncorrelated with the original process, this information is lost and the entropy of the demon - contained in the radiation field - increases [<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 19" title="Binder, P.-M.: Reflections on a wall of light. Science. 322, 1334–1335 (2008)" href="/article/10.1007/s10773-023-05458-x#ref-CR19" id="ref-link-section-d40198907e479">19</a>]. 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