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题名: Quantum Maxwell
作者: Dong, H ;  Xu, DZ ;  Cai, CY ;  Sun, CP
刊名: PHYSICAL REVIEW E
出版日期: 2011
卷号: 83, 期号:6, 页码:61108
关键词: FREE-ENERGY DIFFERENCES ;  2ND LAW ;  ENGINES
学科分类: Physics
通讯作者: Dong, H (reprint author), Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China.
部门归属: [Dong, H.; Xu, D. Z.; Cai, C. Y.; Sun, C. P.] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China
英文摘要: We study the physical mechanism of Maxwell's demon (MD), which helps do extra work in thermodynamic cycles with the heat engine. This is exemplified with one molecule confined in an infinitely deep square potential with a movable solid wall. The MD is modeled as a two-level system (TLS) for measuring and controlling the motion of the molecule. The processes in the cycle are described in a quantum fashion. It is discovered that a MD with quantum coherence or one at a temperature lower than the molecule's heat bath can enhance the ability of the whole working substance, formed by the heat engine plus the MD, to do work outside. This observation reveals that the essential role of the MD is to drive the whole working substance off equilibrium, or equivalently, to work between two heat baths with different effective temperatures. The elaborate studies with this model explicitly reveal the effect of finite size off the classical limit or thermodynamic limit, which contradicts common sense on a Szilard heat engine (SHE). The quantum SHE's efficiency is evaluated in detail to prove the validity of the second law of thermodynamics.
资助者: NSFC [10974209, 10935010]; National 973 Program [2006CB921205]
收录类别: SCI
原文出处: 查看原文
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14339
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Recommended Citation:
Dong, H,Xu, DZ,Cai, CY,et al. Quantum Maxwell[J]. PHYSICAL REVIEW E,2011,83(6):61108.
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