Erlangen 2022 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Atomic systems in external fields

A 8.4: Poster

Dienstag, 15. März 2022, 16:30–18:30, P

Quantum Mpemba Effect in simple spin models — •Simon Kochsiek, Federico Carollo, and Igor Lesanovsky — Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany

In the context of both classical and quantum out-of-equilibrium systems the characteristic time scale that is needed to reach stationarity is of central importance. In particular, if properties of the steady state are to be exploited, the relaxation time is the central hurdle and meta-stable regions become problematic. In a recent work [1] it was shown that the (quantum) Mpemba Effect provides a way of preparing the initial state of the dynamics such that its overlap with slowly decaying modes is minimized.

We investigate the quantum Mpemba Effect in simple spin systems. While the transformation which annihilates the overlap with the slowest decay mode is difficult to implement practically, we show, that even simple product transformations can lead to a significant speed-up of relaxation. Furthermore we explore the connection between system size and interaction strength with the achievable amount of acceleration.

[1] F. Carollo et al., Phys. Rev. Lett. 127, 060401 (2021)