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QI: Fachverband Quanteninformation

QI 31: Decoherence and Open Quantum Systems

QI 31.4: Talk

Friday, March 22, 2024, 10:15–10:30, HFT-FT 101

Systematic coarse-graining of environments for the non-perturbative simulation of open quantum systems — •Nicola Lorenzoni¹, Namgee Cho¹, James Lim¹, Dario Tamascelli^1,2, Susana F. Huelga¹, and Martin B. Plenio¹ — ¹Institut für Theoretische Physik und IQST, Albert-Einstein-Allee 11, Universität Ulm, D-89081 Ulm, Germany — ²Dipartimento di Fisica “Aldo Pontremoli”, Università degli Studi di Milano, Via Celoria 16, 20133 Milano-Italy

Conducting precise electronic-vibrational dynamics simulations of molecular systems poses significant challenges when dealing with an environment composed of numerous vibrational modes. Here, we introduce novel techniques for the construction of effective phonon spectral densities that capture accurately open system dynamics over a finite time interval of interest. When combined with existing non-perturbative simulation tools, our approach can reduce significantly the computational costs associated with many-body open system dynamics.

Keywords: Numerical Methods; Non-perturbative simulation; Tensor Networks; Effective environments