期刊
NEW JOURNAL OF PHYSICS
卷 17, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/17/4/043003
关键词
quantum thermodynamics; Gibbs-preserving maps; thermal operations; resource theory
资金
- SNSF NCCR QSIT
- SNSF [200020-135048]
- ERC [258932]
- COST Action [MP1209]
- EPSRC
- European Research Council (ERC) [258932] Funding Source: European Research Council (ERC)
- Engineering and Physical Sciences Research Council [EP/K026313/1] Funding Source: researchfish
- EPSRC [EP/K026313/1] Funding Source: UKRI
In this brief paper, we compare two frameworks for characterizing possible operations in quantum thermodynamics. One framework considers thermal operations-unitaries which conserve energy. The other framework considers all maps which preserve the Gibbs state at a given temperature. Thermal operations preserve the Gibbs state; hence a natural question which arises is whether the two frameworks are equivalent. Classically, this is true-Gibbs-preserving maps are no more powerful than thermal operations. Here, we show that this no longer holds in the quantum regime: a Gibbs-preserving map can generate coherent superpositions of energy levels while thermal operations cannot. This gap has an impact on clarifying a mathematical framework for quantum thermodynamics.
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