期刊
NEW JOURNAL OF PHYSICS
卷 17, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/17/7/075005
关键词
fluctuation theorems; information thermodynamics; feedback control; free expansion
资金
- Japan Society for the Promotion of Science [26287088, 22103005]
- MEXT of Japan
- Mitsubishi Foundation
- JSPS [254105]
- Advanced Leading Graduate Course for Photon Science (ALPS)
- Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [26287088, 13J04105, 15J00410] Funding Source: KAKEN
We derive quantum nonequilibrium equalities in absolutely irreversible processes. Here by absolute irreversibility we mean that in the backward process the density matrix does not return to the subspace spanned by those eigenvectors that have nonzero weight in the initial density matrix. Since the initial state of a memory and the postmeasurement state of the system are usually restricted to a subspace, absolute irreversibility occurs during the measurement and feedback processes. An additional entropy produced in absolutely irreversible processes needs to be taken into account to derive nonequilibrium equalities. We discuss a model of a feedback control on a qubit system to illustrate the obtained equalities. By introducing Nheat baths each composed of a qubit and letting them interact with the system, we show how the entropy reduction via feedback control can be converted into work. An explicit form of extractable work in the presence of absolute irreversibility is given.
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