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QI: Fachverband Quanteninformation

QI 38: Quantum Thermodynamics

QI 38.8: Vortrag

Freitag, 14. März 2025, 12:45–13:00, HS IX

Quantum Thermodynamics in Strongly Coupled Open Systems: Additivity of Multiple Baths Scenarios — •Tim Alhäuser¹ and Heinz-Peter Breuer^{1, 2} — ¹Institute of Physics, University of 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

Employing the framework of Dynamically Emergent Quantum Thermodynamics [1], an open system approach to non-equilibrium quantum thermodynamics, we discuss the definitions of heat, work and renormalized temperature in strongly coupled and structured environments beyond the Born approximation. Using the Fano-Anderson model [2] we investigate heat and energy transfer in quantum systems. A comparison is made between exact solutions of this model [3] and those obtained through the expansion of the time-convolutionless (TCL) master equation at second and fourth order in both single- and multi-baths cases, demonstrating the performance of the TCL approach. This leads to a unique splitting of the master equation’s dissipator into contributions from individual baths, based on appropriate conditions for the heat currents and bath temperatures.

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

[2] A. Colla and H.-P. Breuer, arXiv: 2408.00649 [quant-ph](2024).

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

Keywords: Open Quantum System; Strong Coupling; non-Markovianity; Multiple Baths; Heat Currents