Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 15: Ultra-cold atoms, ions and BEC II (with Q)

A 15.8: Vortrag

Dienstag, 24. März 2015, 16:15–16:30, C/HSW

Quantum master equation for a BEC with balanced gain and loss — •Dennis Dast, Daniel Haag, Holger Cartarius, and Günter Wunner — 1. Institut für Theoretische Physik, Universität Stuttgart

BECs with balanced gain and loss have been extensively studied in the mean-field limit using a non-Hermitian but PT-symmetric Gross-Pitaevskii equation. However, a microscopic description is desirable since the only physical process capable of describing a gain and loss of the condensate’s wave function is the injection and removal of single particles. We present a quantum master equation in Lindblad form whose mean-field limit is a PT-symmetric Gross-Pitaevskii equation. The master equation supports the characteristic properties of PT-symmetric systems such as the existence of stationary states even for a relatively small number of particles. Furthermore it allows us to investigate many-particle effects of systems with balanced gain and loss which are not accessible in the mean-field limit.