ITP OpenIR  > 理论物理所科研产出  > SCI论文
Dong, H; Xu, DZ; Cai, CY; Sun, CP; Dong, H (reprint author), Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China.
Quantum Maxwell
Source PublicationPHYSICAL REVIEW E
Language英语
KeywordFree-energy Differences 2nd Law Engines
AbstractWe 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.
2011
ISSN1539-3755
Volume83Issue:6Pages:61108
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNSFC [10974209, 10935010]; National 973 Program [2006CB921205] ; NSFC [10974209, 10935010]; National 973 Program [2006CB921205] ; NSFC [10974209, 10935010]; National 973 Program [2006CB921205] ; NSFC [10974209, 10935010]; National 973 Program [2006CB921205]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/14339
Collection理论物理所科研产出_SCI论文
Corresponding AuthorDong, H (reprint author), Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Dong, H,Xu, DZ,Cai, CY,et al. Quantum Maxwell[J]. PHYSICAL REVIEW E,2011,83(6):61108.
APA Dong, H,Xu, DZ,Cai, CY,Sun, CP,&Dong, H .(2011).Quantum Maxwell.PHYSICAL REVIEW E,83(6),61108.
MLA Dong, H,et al."Quantum Maxwell".PHYSICAL REVIEW E 83.6(2011):61108.
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