Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Open Quantum Systems III

Q 57.3: Talk

Thursday, March 5, 2026, 15:00–15:15, P 4

Stable Quantum Trajectories for Pseudo-Lindblad Equations — •Lorenz Wanckel and André Eckardt — Technical University of Berlin, Institute for Physics and Astronomy

In open quantum systems beyond the ultraweak coupling regime, master equations such as the Redfield equation, which are not of Lindblad but of pseudo-Lindblad form, are often used. This prevents the application of the standard Monte Carlo wave-function unraveling introduced by Dalibard et al. The Pseudo-Lindblad Quantum Trajectory (PLQT) approach, introduced by Becker et al., provides an unraveling of pseudo-Lindblad equations without the need to enlarge the Hilbert space, but it exhibits inherent long-time instabilities due to exponentially growing fluctuations. We present a stabilized PLQT algorithm that suppresses these fluctuations, thereby enabling reliable simulations up to and including the steady state.

Keywords: Quantum Trajectories; Redfield; Stochastic Unraveling; Pseudo-Lindblad