Bonn 2025 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 43: Open Quantum Systems II (joint session Q/QI)

QI 43.5: Vortrag

Freitag, 14. März 2025, 12:00–12:15, HS I

Calculating two-time correlations for dissipative, interacting spin systems with phase space methods — •Jens Hartmann and Michael Fleischhauer — RPTU Kaiserslautern, Kaiserslautern, Germany

The recently developed Truncated Wigner Approximation (TWA) for spins [1,2] is a powerful technique to simulate dissipative, interacting spin systems with a large number of spins taking into account leading-order quantum effects. However, determining two-time correlations within phase space approaches is notoriously difficult. We here developed an efficient method to numerically calculate multi-time-correlations of strongly coupled spins and demonstrate its accuracy for different benchmark problems. Furthermore of special interest is the superradiant emission from atoms coupled to a waveguide, which can be described very well with our method [3]. We compute the second order correlation function of the emitted light for different times and see a good agreement between the theoretical and experimental data for the superradiant bursts and the corresponding behavior of the correlation function.

[1,2] C. Mink et al., 10.21468/SciPostPhys.15.6.233, PhysRevResearch.4.043136

[3] F. Tebbenjohanns et al., PhysRevA.110.043713

Keywords: Truncated Wigner Approximation; Waveguide; Phase Space Methods; correlation function; spin systems