SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 8: QI Poster I (joint session QI/Q)
Q 8.4: Poster
Monday, March 6, 2023, 16:30–19:00, Empore Lichthof
Witnessing non-Markovianity in quantum Brownian motion by quasi-probability distributions in phase-space — •Irene Ada Picatoste Fernández1, Moritz Ferdinand Richter1, and Heinz-Peter Breuer1,2 — 1Physikalisches Institut, Universität Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany — 2EUCOR Centre for Quantum Science and Quantum Computing, University of Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany
The theory of open quantum systems aims to describe the dynamics of a quantum system coupled to an environment using a limited number of degrees of freedom. The Caldeira-Leggett model of quantum Brownian motion represents a physically interesting example of such systems showing strong memory effects, i.e., non-Markovian dynamics, in certain parameter regimes. Recently, a witness for non-Markovianity has been developed which is based on the Kolmogorov distance between quasi-probability distributions of two states [1]. Additionally, for Gaussian dynamics, a new measure of non-Markovianity can be defined using exclusively the Glauber-Sudarshan P-function. Here, we apply this witness to the Caldeira-Leggett model and show the behaviour of the non-Markovianity measure in different scenarios, while studying where the witness works best.
[1] M. F. Richter, R. Wiedenmann and H.-P. Breuer, arXiv:2210.06058 [quant-ph].