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Maxwell's demon with antidecoherence.

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Title: Maxwell's demon with antidecoherence.
Authors: Zhang, Zi-Yan1 (AUTHOR), Du, Jian-Ying2 (AUTHOR), Zhang, Fu-Lin1 (AUTHOR) flzhang@tju.edu.cn
Source: Modern Physics Letters A. 9/7/2025, Vol. 40 Issue 27, p1-19. 19p.
Subjects: Coherence (Physics), Decoherence (Quantum mechanics), Maxwell, James Clerk, 1831-1879, Thermodynamics, Quantum states, Heat engines, Quantum measurement
Abstract: Subsystems of a composite system in a pure state generally exist in mixed states and undergo changes with the overall state. This phenomenon arises from the coherence of the entire system and represents a crucial distinction between quantum and classical systems. Such a quantum property can enhance the work output of an Otto heat engine composed of two qubits, whose parameters evolve in opposite directions. When the energy levels of the two qubits are identical at one of the thermal equilibrium states of the Otto cycle and there is no interaction between them, the total work output is strictly negative, which is guaranteed by the second law of thermodynamics. However, the interaction-induced coherence allows for positive work output under such conditions. Our model provides an autonomous implementation of Maxwell's demon, where the measurement and feedback operations are driven by an adiabatically evolved Hamiltonian without external intervention. Furthermore, the coherence of the entire system is amplified by the heat reservoir after measurement, which is the key of the positive work output. Conversely, the quantum measurement-erase cycle typically outputs negative work, attributed to the decoherence of the instrument during the measurement process. [ABSTRACT FROM AUTHOR]
Copyright of Modern Physics Letters A is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="JN" term="%22Modern+Physics+Letters+A%22">Modern Physics Letters A</searchLink>. 9/7/2025, Vol. 40 Issue 27, p1-19. 19p.
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  Data: Subsystems of a composite system in a pure state generally exist in mixed states and undergo changes with the overall state. This phenomenon arises from the coherence of the entire system and represents a crucial distinction between quantum and classical systems. Such a quantum property can enhance the work output of an Otto heat engine composed of two qubits, whose parameters evolve in opposite directions. When the energy levels of the two qubits are identical at one of the thermal equilibrium states of the Otto cycle and there is no interaction between them, the total work output is strictly negative, which is guaranteed by the second law of thermodynamics. However, the interaction-induced coherence allows for positive work output under such conditions. Our model provides an autonomous implementation of Maxwell's demon, where the measurement and feedback operations are driven by an adiabatically evolved Hamiltonian without external intervention. Furthermore, the coherence of the entire system is amplified by the heat reservoir after measurement, which is the key of the positive work output. Conversely, the quantum measurement-erase cycle typically outputs negative work, attributed to the decoherence of the instrument during the measurement process. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Modern Physics Letters A is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1142/S0217732325501044
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      – Code: eng
        Text: English
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        PageCount: 19
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      – SubjectFull: Coherence (Physics)
        Type: general
      – SubjectFull: Decoherence (Quantum mechanics)
        Type: general
      – SubjectFull: Maxwell, James Clerk, 1831-1879
        Type: general
      – SubjectFull: Thermodynamics
        Type: general
      – SubjectFull: Quantum states
        Type: general
      – SubjectFull: Heat engines
        Type: general
      – SubjectFull: Quantum measurement
        Type: general
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      – TitleFull: Maxwell's demon with antidecoherence.
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            NameFull: Zhang, Zi-Yan
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            NameFull: Du, Jian-Ying
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            NameFull: Zhang, Fu-Lin
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            – D: 07
              M: 09
              Text: 9/7/2025
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              Y: 2025
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