Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 69: Ultra-cold atoms, ions and BEC IV (joint session A/Q)

Q 69.6: Talk

Friday, March 18, 2022, 12:00–12:15, A-H1

Resetting many-body quantum systems — •Gabriele Perfetto, Federico Carollo, Matteo Magoni, and Igor Lesanovsky — Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany

We consider closed quantum many-body systems subject to stochastic resetting. This means that their unitary time evolution is interrupted by resets at randomly selected times. The study of the non-equilibrium stationary state that emerges from the combination of stochastic resetting and coherent quantum dynamics has recently raised significant interest. The connection between this non-equilibrium stationary state, an effective open dynamics and non-equilibrium signatures of quantum phase transitions is, however, not fully understood.

In the talk we provide a unified understanding of these phenomena by combining techniques from quantum quenches in closed systems and semi-Markov processes. We discuss as an application the paradigmatic quantum Ising chain. We show that signatures of its ground-state quantum phase transition are visible in the steady state of the reset dynamics as a sharp crossover.

Our findings show that stochastic resetting can be exploited to generate many-body quantum stationary states where incoherent effects, such as heating, can be hindered. These stationary states can be then used in quantum simulator platforms for sensing applications.

[1] G.Perfetto et al., Phys. Rev. B 104, L180302 (2021)