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Entropy, Volume 25, Issue 2

February 2023 - 211 articles

Cover Story: The quest to invent thermal machines at the nanoscale has led to the new field of quantum thermodynamics. Recent technological advancement has enabled the experimental realization of quantum thermal machines powered by measurements and feedback, such as Maxwell’s demons and Szilard’s engines. These are devices where measurements and feedback allow, respectively, the extraction of heat or work from a single thermal bath. We study two different configurations of coupled-qubit-based thermal devices powered by discrete as well as continuous weak quantum measurements, namely a quantum Maxwell’s demon, and a measurement-assisted refrigerator. The measurement-assisted refrigerator extracts heat from a cold bath, exploiting the combination of external work and invasive quantum measurements. View this paper
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Articles (211)

  • Article
  • Open Access
6 Citations
2,829 Views
17 Pages

19 February 2023

Recently, advances in detection and re-identification techniques have significantly boosted tracking-by-detection-based multi-pedestrian tracking (MPT) methods and made MPT a great success in most easy scenes. Several very recent works point out that...

  • Article
  • Open Access
9 Citations
8,445 Views
13 Pages

Earthquake Nowcasting: Retrospective Testing in Greece

  • Gerasimos Chouliaras,
  • Efthimios S. Skordas and
  • Nicholas V. Sarlis

19 February 2023

Earthquake nowcasting (EN) is a modern method of estimating seismic risk by evaluating the progress of the earthquake (EQ) cycle in fault systems. EN evaluation is based on a new concept of time, termed ’natural time’. EN employs natural...

  • Article
  • Open Access
7 Citations
2,295 Views
13 Pages

18 February 2023

Face recognition technology has developed rapidly in recent years, and a large number of applications based on face recognition have emerged. Because the template generated by the face recognition system stores the relevant information of facial biom...

  • Article
  • Open Access
37 Citations
11,906 Views
16 Pages

Cryptocurrencies Are Becoming Part of the World Global Financial Market

  • Marcin Wątorek,
  • Jarosław Kwapień and
  • Stanisław Drożdż

18 February 2023

In this study the cross-correlations between the cryptocurrency market represented by the two most liquid and highest-capitalized cryptocurrencies: bitcoin and ethereum, on the one side, and the instruments representing the traditional financial mark...

  • Article
  • Open Access
2 Citations
2,559 Views
37 Pages

18 February 2023

Quantum information applications emerged decades ago, initially introducing a parallel development that mimicked the approach and development of classical computer science. However, in the current decade, novel computer-science concepts were rapidly...

  • Article
  • Open Access
4 Citations
2,971 Views
16 Pages

18 February 2023

Voice conversion (VC) consists of digitally altering the voice of an individual to manipulate part of its content, primarily its identity, while maintaining the rest unchanged. Research in neural VC has accomplished considerable breakthroughs with th...

  • Article
  • Open Access
9 Citations
3,187 Views
15 Pages

Effective Connectivity and Bias Entropy Improve Prediction of Dynamical Regime in Automata Networks

  • Felipe Xavier Costa,
  • Jordan C. Rozum,
  • Austin M. Marcus and
  • Luis M. Rocha

18 February 2023

Biomolecular network dynamics are thought to operate near the critical boundary between ordered and disordered regimes, where large perturbations to a small set of elements neither die out nor spread on average. A biomolecular automaton (e.g., gene,...

  • Article
  • Open Access
6 Citations
5,035 Views
18 Pages

Dollar-Yuan Battle in the World Trade Network

  • Célestin Coquidé,
  • José Lages and
  • Dima L. Shepelyansky

17 February 2023

From the Bretton Woods agreement in 1944 till the present day, the US dollar has been the dominant currency in world trade. However, the rise of the Chinese economy has recently led to the emergence of trade transactions in Chinese yuan. Here, we mat...

  • Article
  • Open Access
17 Citations
5,162 Views
19 Pages

17 February 2023

In this article, we show that a quantum gas, a collection of massive, non-interacting, indistinguishable quantum particles, can be realized as a thermodynamic machine as an artifact of energy quantization and, hence, bears no classical analog. Such a...

  • Article
  • Open Access
7 Citations
3,573 Views
25 Pages

17 February 2023

Emerging or diminishing nonlinear interactions in the evolution of a complex system may signal a possible structural change in its underlying mechanism. This type of structural break may exist in many applications, such as in climate and finance, and...

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Entropy - ISSN 1099-4300