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QI: Fachverband Quanteninformation

QI 38: Quantum Thermodynamics

QI 38.7: Vortrag

Freitag, 14. März 2025, 12:30–12:45, HS IX

Nonequilibrium quantum thermodynamics without detailed balance — •Irene Ada Picatoste¹ and Heinz-Peter Breuer^1,2 — ¹Physikalisches Institut, Universität Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany — ²EUCOR Centre for Quantum Science and Quantum Computing, University of Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany

We study quantum Brownian motion through the paradigmatic Caldeira-Leggett model describing a central mode coupled to a thermal bath of modes. Starting from the microscopic solution, we construct an exact, time-convolutionless master equation for the reduced state of the central mode [1] and, using a recently developed approach to nonequilibrium quantum thermodynamics [2], we find an effective energy operator using the principle of minimal dissipation. We then examine the instantaneous fixed point of the dynamics and use its jump operators to understand the mechanisms governing the dynamics. We identify two different processes: a particle exchange generator in the detailed balance form that drives the system towards a Gibbs state [3] and, due to the absence of the rotating wave approximation, an additional squeezing generator.

[1] I. A. Picatoste, A. Colla, and H.-P. Breuer, Phys. Rev. Research 6, 013258 (2024).

[2] A. Colla and H.-P. Breuer, Phys. Rev. A 105, 052216 (2022).

[3] A. Colla and H.-P. Breuer, arXiv preprint 2408.00649 (2024).

Keywords: open quantum systems; quantum thermodynamics; non-markovian evolution; quantum brownian motion; master equation