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Guaranteed energy-efficient bit reset in finite time

zqyin 添加于 2014-9-16 09:33 | 1105 次阅读 | 0 个评论

作者
Browne C, Garner AJP, Dahlsten OCO, Vedral V
摘要
Landauer\'s principle states that it costs at least kTln2 of work to reset one bit in the presence of a heat bath at temperature T. The bound of kTln2 is achieved in the unphysical infinite-time limit. Here we ask what is possible if one is restricted to finite-time protocols. We prove analytically that it is possible to reset a bit with a work cost close to kTln2 in a finite time. We construct an explicit protocol that achieves this, which involves changing the system\'s Hamiltonian avoiding quantum coherences, and thermalising. Using concepts and techniques pertaining to single-shot statistical mechanics, we further develop the limit on the work cost, proving that the heat dissipated is close to the minimal possible not just on average, but guaranteed with high confidence in every run. Moreover we exploit the protocol to design a quantum heat engine that works near the Carnot efficiency in finite time.
详细资料
- 关键词: quant-ph
- 文献种类: Journal Article
- 期刊缩写: Phys. Rev. Lett.
- 期卷页: 2014年第113卷 100603页
- 日期: 2014-9-13
- 发布方式: arXiv e-prints
- 备注:arXiv:1311.7612v2; 5 pages + 5 page technical appendix. 5 figures. Author accepted version; Journal Ref: Phys. Rev. Lett. 113, 100603 (2014)
学科领域自然科学 » 物理学
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