Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 7: Quantum Thermodynamics
QI 7.3: Talk
Tuesday, March 10, 2026, 10:00–10:15, BEY/0E17
Exact heat currents for multi-bath open quantum systems — •Matteo Garbellini1, Valentin Link2, and Walter Strunz1 — 1Institut für Theoretische Physik, Technische Universität Dresden, Dresden, Germany — 2Technische Universität Berlin, Berlin, Germany
I present a numerically exact method for computing stationary heat currents in small quantum systems coupled to multiple bosonic reservoirs at different temperatures. Our approach leverages the recently introduced uniTEMPO method [1], which efficiently generates compressed auxiliary environments for non-Markovian Gaussian baths. Building upon this, we are able to efficiently compute heat currents into the reservoirs in both transient and steady-state regimes.
We apply our method to a single qubit strongly coupled to two baths and analyze how different coupling operators and the structure of the environments affect heat transport. Finally, we apply the method to quantum refrigeration. For a three-level system coupled to two reservoirs, we find that although autonomous global refrigeration does not occur, a frequency-resolved analysis reveals local cooling of specific environmental modes, suggesting a route to exploiting this localized effect with additional weakly coupled modes.
[1] V. Link, H.-H. Tu, and W. T. Strunz, Phys. Rev. Lett. 132, 200403 (2024)
Keywords: Heat currents; Tensor network method; Heat transport