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arxiv 2205.10212 v2 pith:NR2WH47Q submitted 2022-05-20 quant-ph

Thermodynamically consistent master equation based on subsystem eigenstates

classification quant-ph
keywords masterequationinteractionsintersubsystemlocalapproacheigenstatesequations
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Master equations under appropriate assumptions are efficient tools for the study of open quantum systems. For many-body systems, subsystems of which locally couple to thermal baths and weakly interact with each other, the local approach provides a more convenient description than the global approach. However, these local master equations are believed to generate inconsistencies with the laws of thermodynamics when intersubsystem interactions exist. Here we develop an alternative local master equation by virtue of similar approximations used in deriving the traditional Gorini-Kossakowski-Lindblad-Sudarshan master equation. In particular, we stick to using eigenstates of each subsystem to construct quantum jump operators, and the secular approximation is also employed to modify the intersubsystem interactions. Our results show that violations of thermodynamic laws will be avoided after correcting intersubsystem interactions. Finally, We study a two-qubit heat transfer model and this further shows the validity of our modified master equation.

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