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DY: Fachverband Dynamik und Statistische Physik

DY 31: Focus Session: Nonequilibrium Collective Behavior in Open Classical and Quantum Systems

DY 31.3: Vortrag

Donnerstag, 20. März 2025, 10:00–10:15, H37

entropy production in ultrafast quantum stochastic dynamics — •Yulong Qiao and Matthias Geilhufe — Department of Physics, Chalmers University of Technology, Gothenburg, Sweden

Thanks to advancements in femto- and atto-second laser technologies, thermodynamics has entered the ultrafast era. Ultrafast dynamics provides a unique way to probe the transient properties of materials. In [1], ultrafast stochastic thermodynamics was developed based on X-ray scattering experiments [2], and has been successfully applied to the study of entropy production in laser-excited phonons. However, how to develop a unifying theory for both classical and quantum systems remains an open challenge [3].

In the quantum realm, fluctuations arising from the uncertainty principle do not depend on temperature, meaning they are inevitable even in a vacuum. As a result, in the quantum analogues of the Langevin equations, classical stochastic forces are replaced by quantum noise operators. In this talk, I will discuss how to handle the quantum nosies in the frame of open quantum systems. I will also present the impact of quantum effects on the entropy production in the ultrafast processes.

[1] L. Caprini, H. Löwen, and R. M. Geilhufe, Nat. Commun. 15, 94 (2024).

[2] M. Kozina. et al., Nat. Phys. 15, 387 (2019).

[3] G.T. Landi and M. Paternostro, Rev. Mod. Phys. 93, 035008 (2021).

Keywords: entropy production; ultrafast thermodynamics; quantum noise