It is now widely accepted that Maxwell’s demon does not, in fact, break the second law of thermodynamics, if the energetic cost of resetting its memory is taken into account. This resolution of the paradox is known as Landauer’s principle.

In this work, **we delve into the inner workings of Maxwell’s demon by considering how it behaves in the quantum error correction setting**. We show that Landauer’s principle is only the limiting case of a more general triple trade-off relation between the thermodynamic, information-theoretic, and logic performances of the demon. For example, we show that for most measurements that the demon can perform, extracting work above the Carnot limit is penalized by a drop in the error correction fidelity. Moreover, when the demon successfully performs perfect error correction, work extraction above the Carnot limit becomes impossible with most quantum measurements. Finally, we realize that the amount of information that the demon can extract about the error type is bounded from above by the dissipated heat during that process.** Interestingly, this also gives physical meaning to negative values of this information gain.**

In Dante’s Purgatorio, Canto III, Virgil warns Dante about the limits of human intellect, which is able to understand and describe relations between events (the *quia*, Latin for “because/for”), but not the events’ “true reality”.

Fast forward to the 21st century, I believe that this viewpoint is close in spirit to the idea, which I’m very fond of at present, that the deepest laws of physics tell us more about our “learning mechanisms” than they do about “reality” (whatever that means).

Here is the excerpt from Dante’s Purgatorio, Canto III, verses 37-45:

“State contenti, umana gente, al *quia*,

che se possuto aveste vedere tutto

mestier non era parturir Maria;

e disiar vedeste sanza frutto

tai che sarebbe lor disio quetato,

ch’etternalmente è dato lor per lutto:

io dico d’Aristotile e di Plato

e di molt’altri”; e qui chinò la fronte,

e più non disse, e rimase turbato.

The same excerpt in English:

“Mortals, remain contented at the *quia*;

For if ye had been able to see all,

No need there were for Mary to give birth;

And ye have seen desiring without fruit,

Those whose desire would have been quieted,

Which evermore is given them for a grief.

I speak of Aristotle and of Plato,

And many others;” and here bowed his head,

And more he said not, and remained disturbed.

**Description**: this position is offered by the Quantum Information Theory Group within the collaboration “Extreme Universe”, headed by Prof. Tadashi Takayanagi (YITP, Kyoto University). This collaboration brings together Japan-based world-renowned researchers in quantum information theory, quantum gravity, cosmology, and condensed matter physics, with the aim of creating new and exciting bridges between these very active areas of research. The successful candidate will work in close contact with Prof. Francesco Buscemi (Nagoya University), but is expected to interact also with the rest of the collaboration group and to participate in various interdisciplinary meetings within the project. The successful candidate is expected to commence their appointment on April 2022 or as soon as possible after that.

**Requirements**: applicants are expected to hold a PhD degree in a theoretical field related to quantum information sciences by the time they begin their appointment. Ideally, they will be familiar with recent ideas and techniques in quantum information theory and have at the same time strong interests in fundamental questions in theoretical physics.

**Submission procedure**: interested candidates should provide

- a cover letter;
- an up-to-date
*curriculum vitae*; - a research statement;
- an up-to-date list of research achievements (including published papers, preprints, talks, posters, etc.);
- contact information of three references able to provide recommendation letters upon request.

The application can be done by sending the above documents directly to buscemi@nagoya-u.jp or through the project’s webpage at https://academicjobsonline.org/ajo/jobs/19880 (where also other openings are advertised)

**Submission deadline**: 30 November 2021

For further inquiries, please contact me at buscemi@nagoya-u.jp

]]>I am jealously preserving all my handwritten scores, but recently I also found a transcription I made in Finale (I believe that was the 1998 version; a real pain to use) and here is its MIDI rendition: enjoy!

]]>“The law that entropy always increases holds, I think, the supreme position among the laws of Nature. If someone points out to you that your pet theory of the universe is in disagreement with Maxwell’s equations – then so much the worse for Maxwell’s equations. If it is found to be contradicted by observation—well, these experimentalists do bungle things sometimes. But if your theory is found to be against the Second Law of Thermodynamics I can give you no hope; there is nothing for it to collapse in deepest humiliation.”

― Arthur Eddington, The Nature of the Physical World, Chap. 4But why is that so? Why is the Second Law so “special” among the other laws of physics?

Simply because—as we argue in a paper recently published on Physical Review E and freely available on the arXiv*—the Second Law is not so much about physics, as it is about logic* and consistent reasoning. More precisely, we argue that the Second Law can be seen as the shadow of a deeper asymmetry that exists in statistical inference between prediction and retrodiction, and ultimately imposed by the consistency of the Bayes–Laplace Rule.

A little bit of background. In the past two decades, thermodynamics has undergone unprecedented progresses. These can be traced back to the developments of stochastic thermodynamics, on the one hand, and the theory of nonequilibrium fluctuations, on the other. The latter, in particular, has shown that the Second Law *emerges* from a more fundamental “balance relation” between a physical process and its reverse. According to such a balance relation, for example, scrambled eggs are not *forbidden* to unscramble spontaneously—instead, the probability of such a process is just extremely tiny, compared with that of its more familiar reverse. In turn, entropy—i.e. the thing that “no one knows what it really is”, according to the apocryphal exchange between Shannon and von Neumann—precisely is a measure of such a disparity.

In this paper we go one step further and show that the existence of a disparity is not due to some kind of “physical propensity” that irreversible processes have for unfolding in one direction more likely than in the opposite direction—an explanation that would lead to a circular argument—, but to the *intrinsic asymmetry that exists between prediction and retrodiction in inferential logic*. We thus conclude that the foundations of the Second Law are not to be found *within* physics, but one step *below*, at the level of logic.

A nice little piece written by CQT/NUS outreach is also available here.

]]>The preprint is available on the arXiv: https://arxiv.org/abs/2009.02849

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