## Quantum irreversibility of quasistatic protocols for finite-size quantized systems

#### by Mr. Yehoshua Winsten

*Physics department, BGU*

##### at Condensed Matter Seminar

Mon, 01 Jul 2024, 11:10

Sacta-Rashi Building for Physics (54), room 207

#### Abstract

Quantum mechanically, a driving process is expected to be reversible in the quasistatic limit, also known as the adiabatic theorem. This statement stands in opposition to classical mechanics, where a mix of regular and chaotic dynamics implies irreversibility. A paradigm for demonstrating the signatures of chaos in quantum irreversibility is a sweep process whose objective is to transfer condensed bosons from a source orbital. We show that such a protocol is dominated by an interplay of adiabatic-shuttling and chaos-assisted depletion processes. The latter is implied by interaction terms that spoil the Bogoliubov integrability of the Hamiltonian. As the sweep rate is lowered, a crossover to a regime that is dominated by quantum fluctuations is encountered, featuring a breakdown of quantum-to-classical correspondence. The major aspects of this picture are not captured by the common two-orbital approximation, which implies failure of the familiar many-body Landau-Zener paradigm.

[1] Y. Winsten and D. Cohen, "Quantum irreversibility of quasistatic protocols for finite-size quantized systems", Phys. Rev. A 107, 052202 (2023)

[2] Y. Winsten and D. Cohen, "Quasistatic transfer protocols for atomtronic superfluid circuits", Sci Rep 11, 3136 (2021)

Created on 30-06-2024 by Naamneh, Muntaser (mnaamneh)

Updaded on 30-06-2024 by Naamneh, Muntaser (mnaamneh)