Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Quantum Effects

Q 24.12: Poster

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

Collective decay in a dissipative Rydberg-gas — •Chris Nill, Federico Carollo, and Igor Lesanovsky — Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany

We analyse the dynamics and the steady state of a driven open quantum spin system, which models the dynamics of a strongly interacting gas of Rydberg atoms, weakly coupled to a Markovian bath.
A common approach to describe the dissipation of such systems is to choose single-site dissipation, such as spin decay or dephasing [1]. However, the strong interaction among Rydberg atoms is expected to give rise to dissipative processes with an additional dependency on neighbouring excited atoms.
We simulate the excitation dynamics within both approaches and highlight their differences. To this end we utilise exact diagonalisation, quantum jump Monte-Carlo simulations and mean-field calculations. We identify parameter regimes in which the difference between single-site and interaction-dependent dissipation becomes most pronounced and might be tested experimentally.
[1] C. Ates et al., Phys. Rev. A 85, 043620 (2012)