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• W4226468501 abstract "The Gibbs state is widely taken to be the equilibrium state of a system in contact with an environment at temperature T. However, non-negligible interactions between system and environment can give rise to an altered state. Here, we derive general expressions for this mean force Gibbs state, valid for any system that interacts with a bosonic reservoir. First, we derive the state in the weak coupling limit and find that, in general, it maintains coherences with respect to the bare system Hamiltonian. Second, we develop a new expansion method suited to investigate the ultrastrong coupling regime. This allows us to derive the explicit form for the mean force Gibbs state, and we find that it becomes diagonal in the basis set by the system-reservoir interaction instead of the system Hamiltonian. Several examples are discussed including a single qubit, a three-level V-system, and two coupled qubits all interacting with bosonic reservoirs. The results shed light on the presence of coherences in the strong coupling regime, and provide key tools for nanoscale thermodynamics investigations." @default.
• W4226468501 created "2022-05-05" @default.
• W4226468501 creator A5026408313 @default.
• W4226468501 creator A5083661181 @default.
• W4226468501 date "2021-12-17" @default.
• W4226468501 modified "2023-10-18" @default.
• W4226468501 title "Weak and Ultrastrong Coupling Limits of the Quantum Mean Force Gibbs State" @default.
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• W4226468501 doi "https://doi.org/10.1103/physrevlett.127.250601" @default.
• W4226468501 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35029453" @default.
• W4226468501 hasPublicationYear "2021" @default.
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