期刊
NEW JOURNAL OF PHYSICS
卷 24, 期 3, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac57ea
关键词
quantum thermodynamics; quantum feedback control; Maxwell demon
资金
- project PACSS [RTI2018-093732-B-C21]
- project QuTTNAQMa [PID2020-117347GB-I00]
- Maria de Maeztu Program for Centers and Units of Excellence in RD - MCIN/AEI [MDM-2017-0711]
- EU through FEDER funds
- GOIB project [MACTOPE PDR2020-12]
- National Research Foundation of Korea [2021R1A6A3A03040076]
- National Research Foundation of Korea [2021R1A6A3A03040076] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Researchers introduce a robust Maxwell demon that can generate many-body entanglement against bit-flip noises, leading to quantum advantage. They utilize the voter model protocol and derive upper bounds for entropy reduction and work extraction rates. These findings suggest that many-body entanglement stabilization and work extraction are possible under certain conditions.
We introduce a Maxwell demon which generates many-body entanglement robustly against bit-flip noises, allowing us to obtain quantum advantage. Adopting the protocol of the voter model used for opinion dynamics approaching consensus, the demon randomly selects a qubit pair and performs a quantum feedback control, in continuous repetitions. We derive upper bounds for the entropy reduction and the work extraction rates by the demon's operation. These bounds are determined by a competition between the quantum-classical mutual information acquired by the demon and the absolute irreversibility of the feedback control. Our finding of the upper bounds corresponds to a reformulation of the second law of thermodynamics under a class of Maxwell demon which generates many-body entanglement in a working substance. This suggests that a general condition for the operation of a successful entangling demon, one for which many-body entanglement stabilization and work extraction are possible, is that the information gain is larger than the absolute irreversibility.
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