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Entropy
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Quantum Measurement
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Quantum Measurement

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Quantum Information".

Deadline for manuscript submissions: 9 July 2025 | Viewed by 1899

Special Issue Editor

Prof. Dr. Marcin Wieśniak

E-Mail Website
Guest Editor
Faculty of Mathematics, Physics, and Informatics, Institute of Theoretical Physics and Astrophysics, University of Gdańsk, 80-308 Gdańsk, Poland
Interests: quantum foundations; quantum correlations; entanglement; Bell's theorem; quantum optics; quantum thermodynamics; spin systems

Special Issue Information

Dear Colleagues,

Understanding the mechanisms governing physical reality has always been an important part of shaping our survival strategies. Quantum mechanics arguably posed one of the biggest issues in our struggle to provide the theory of Nature. While free evolution is well described by Schrödinger’s equation, how we learn about properties of quantum systems remains a topic of eternal debate. One could, for example, wonder why we observe only one outcome, why this particular outcome, and why not any other.  One may conclude that in fact this is not the case, and all possible scenarios of evolution are realized. Alternatively, it may seem that free dynamics is somehow perturbated during a measurement. This possibility calls for new physics, which could explain this behavior. The purpose of this Special Issue is to establish an agora for exchanging viewpoints on the quantum measurement problem. 

As an occasional contributor to experimental projects, I needed a space to express my ideas in a certain language of particles propagating and eventually yield a certain answer. Regardless of individual beliefs about our role as observers in the Universe, we deserve an explanation of what such words can mean in a practical sense to be able to further collaborate on such experiments, which would, for example, provide us with an advantage in communication, metrology, and computational tasks. In turn, this can influence the development of other physical theories and even the security of society.

Prof. Dr. Marcin Wieśniak
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Entropy is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • foundations of physics
  • quantum measurement
  • quantum collapse
  • non-demolishing quantum measurements
  • emergence of classicality

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Published Papers (2 papers)

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Research

20 pages, 4483 KiB  
Article
Quantum Weak Values and the “Which Way?” Question
by Anton Uranga, Elena Akhmatskaya and Dmitri Sokolovski
Entropy 2025, 27(3), 259; https://doi.org/10.3390/e27030259 - 1 Mar 2025
Viewed by 557
Abstract
The Uncertainty Principle forbids one to determine which of the two paths a quantum system has travelled, unless interference between the alternatives had been destroyed by a measuring device, e.g., by a pointer. One can try to weaken the coupling between the device [...] Read more.
The Uncertainty Principle forbids one to determine which of the two paths a quantum system has travelled, unless interference between the alternatives had been destroyed by a measuring device, e.g., by a pointer. One can try to weaken the coupling between the device and the system in order to avoid the veto. We demonstrate, however, that a weak pointer is at the same time an inaccurate one, and the information about the path taken by the system in each individual trial is inevitably lost. We show also that a similar problem occurs if a classical system is monitored by an inaccurate quantum meter. In both cases, one can still determine some characteristic of the corresponding statistical ensemble, a relation between path probabilities in the classical case, and a relation between the probability amplitudes if a quantum system is involved. Full article
(This article belongs to the Special Issue Quantum Measurement)
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16 pages, 252 KiB  
Article
How to Be a Copenhagenistic-QBistic Everettist
by Marcin Wieśniak
Entropy 2025, 27(3), 248; https://doi.org/10.3390/e27030248 - 27 Feb 2025
Viewed by 920
Abstract
The measurement problem in quantum mechanics (QM) is related to the inability to include learning about the properties of a quantum system by an agent in the formalism of quantum theory. It includes questions about the physical processes behind the measurement, uniqueness, and [...] Read more.
The measurement problem in quantum mechanics (QM) is related to the inability to include learning about the properties of a quantum system by an agent in the formalism of quantum theory. It includes questions about the physical processes behind the measurement, uniqueness, and randomness of obtained outcomes and an ontic or epistemic role of the state. These issues have triggered various interpretations of quantum theory. They vary from refusing any connection between physical reality and a measurement process to insisting that a collapse of the wave-function is real and possibly involves consciousness. On the other hand, the actual mechanism of a measurement is not extensively discussed in these interpretations. This essay attempts to investigate the quantum measurement problem from the position of the scientific consensus. We begin with a short overview of the development of sensing in living organisms. This is performed for the purpose of stressing the relation between reality and our experience. We then briefly present different approaches to the measurement problem in chosen interpretations. We then state three philosophical assumptions for further consideration and present a decomposition of the measurement act into four stages: transformation, conversion, amplification and broadcasting, and, finally, perception. Each of these stages provides an intuition about the physical processes contributing to it. These conclusions are then used in a discussion about, e.g., objectivity, the implausibility of reversing a measurement, or the epistemic status of the wave-function. Finally, we argue that those in favor of some of the most popular interpretations can find an overlap between their beliefs and the consequences of considerations presented here. Full article
(This article belongs to the Special Issue Quantum Measurement)
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