Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 63: Poster – Quantum Information (joint session QI/Q)

Q 63.69: Poster

Thursday, March 13, 2025, 17:00–19:00, Tent

Correlations in non Markovian Open Quantum System Dynamics — •Isabelle McEntee, Adrian Romer, and Christiane P. Koch — Freie Universität Berlin, Berlin, Germany

Open quantum systems are complex and not easily described. To simulate these dynamics with an equation of motion, we must make many assumptions, in particular weak system bath coupling and Markovianity. This work focuses on two methods that do not make these assumptions and allow for the simulation of correlations that occur in non Markovian dynamics. The first is called the Surrogate Hamiltonian method (Baer & Kosloff, 1997, The Journal of Chemical Physics), here the number of bath modes that interact with our system is limited to create a smaller, finite surrogate bath. This method treats correlations through different configurations of bath excitations. The second method (Chin et al., 2010, Journal of Mathematical Physics), involves mapping system and bath onto a semi-infinite chain which is evaluated using the Density Matrix Renormalization Group (DMRG) technique. This technique allows for correlations to be treated through tensor decomposition. Both methods truncate the bath and thus the system-bath correlations. We study and compare how correlations are built in these two approaches.

Keywords: Open quantum systems; Quantum dissipative dynamics