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DY: Fachverband Dynamik und Statistische Physik

DY 16: Quantum Dynamics, Decoherence and Quantum Information

DY 16.2: Vortrag

Dienstag, 2. April 2019, 10:15–10:30, H6

Lindblad equation for thermal environments beyond the rotating-wave approximation — •Tobias Becker, Lingna Wu, and André Eckardt — Max Planck Institute for the Physics of Complex Systems, Dresden

Many problems addressing open quantum systems (for weak system-bath coupling) start from a master equation in Lindblad form. In particular, it is needed for quantum trajectory simulations. For thermal environments, such a Lindblad-type master equation can be derived starting from the Redfield-equation (Born-Markov approximation) by applying a rotating-wave approximation. However, this approximation requires extremely weak system-bath coupling, which is small compared to the level splitting in the system. Here, we describe an alternative approximation to the Redfield equation, which also leads to a master equation in Lindblad form. It is valid also for larger system-bath coupling. We test our results using the example of a system of interacting bosons in a double well coupled to an Ohmic bath.