Special Issue "Quantum Darwinism, Decoherence, and the Randomness of Quantum Jump: Fundamentals and Applications"

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: 15 April 2024 | Viewed by 163

Special Issue Editor

1. International Centre for Theory of Quantum Technologies, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
2. Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland
Interests: quantum Darwinism; quantum cryptography; philosophy

Special Issue Information

Dear Colleagues,

Among the many symmetries present in all physical theories, one of the deepest and most fundamental is the one contained in the postulate that the time evolution of a closed quantum system is described by a unitary transformation of the initial state. Thus, the complete reversibility of, at least in principle, all the processes described by the laws of quantum mechanics is established.

At the same time, there is an obvious conflict of the mentioned postulate with the observation that, for all practical purposes, each quantum measurement necessarily leads to a projection of the previous quantum state on one of the eigenvalues ​​of the observable under consideration. From this follows the loss of all other features of this quantum state and, consequently, loss of the reversibility and time symmetry of the quantum evolution. One of the leading approaches to solving the above tension is the theory of decoherence and quantum Darwinism, explaining the emergence of classical information and irreversibility in individual subsystems while maintaining the unitarity of the evolution of the complete system.

Quantum Darwinism, as demonstrated by W. Żurek, also showed the role of symmetry in the derivation of Born's Rule together with the additivity of the probabilities, using a mechanism called entanglement-assisted invariance or envariance. For this purpose, the symmetry of entangled quantum states alone has proved to be sufficient, without resorting to decoherence theory tools, such as partial traces of density matrices. Żurek referred to Laplace's intuition, stating that the symmetry of elementary events implies the identity of their probabilities. As a result, Żurek, based solely on symmetry considerations, showed irrelevance of phases for local states, thus implying decoherence, and was also able to explain the nature of quantum jumps.

In quantum Darwinism, the basis for defining the objectivity of observation is the symmetry between individual observers, for which the possibility of independent and identical access to classical information about the measurement result is postulated. Moreover, recently, another kind of symmetry called strong symmetry, phrasing equivalence between the different ways of coding classical information, proved to be a sufficient condition for the occurrence of some form of quantum Darwinism.

One should also bear in mind the fact that assumptions regarding their symmetry are of great practical importance for the study of decoherence models and information flow. Due to the high complexity of the macroscopic systems needed to demonstrate quantum Darwinism, virtually all information flow scenarios studied so far had to refer to systems with high symmetry to simplify the calculations.

In this Special Issue, we want to take a closer look at how new considerations based on recognizing or applying symmetry can contribute to the deepening of the understanding and development of quantum Darwinism. The considerations will concern both the identification of new places in the theory where symmetries have not been found so far, as well as propositions on how methods based on symmetrization or the assumption of certain symmetries may lead to the widening of the scope of the studied phenomena within quantum Darwinism.

Dr. Piotr Mironowicz
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. Symmetry 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 2400 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.


  • quantum Darwinism
  • symmetries
  • quantum information
  • classical information
  • fundamentals of quantum mechanics
  • decoherence
  • quantum jumps
  • quantum open systems

Published Papers

This special issue is now open for submission.
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