SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 8: QI Poster I (joint session QI/Q)

Q 8.32: Poster

Monday, March 6, 2023, 16:30–19:00, Empore Lichthof

Treating finite system-bath coupling using the hierarchy-of-pure-states approach — •Johann Aßmus, Tobias Becker, and André Eckardt — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany

Open quantum system dynamics can be described by master equations for the system's reduced density matrix, however, the derivation of these equations often requires some assumptions like the Born-Markov-approximation. The hierarchy-of-pure-states approach is an alternative to master equations where the system is described by a stochastic ensemble of pure states and additional auxiliary states [1]. Since the dynamics of these pure states can be derived without any approximations, this approach is numerically exact. However, an approximation is made, by allowing for a finite number of auxiliary states. We compare the solutions of this method with the exact dynamics of a damped harmonic oscillator to examine its behaviour in regards to the number of hierarchies and other parameters.

[1] D. Süß, A. Eisfeld, W.T. Strunz, Phys. Rev. Lett. 113, 150403 (2014)