Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

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

Q 63.29: Poster

Donnerstag, 13. März 2025, 17:00–19:00, Tent

Efficient tensor network simulation of open quantum systems with realistic environments — •Matteo Garbellini, Valentin Link, and Walter Strunz — Institut für Theoretische Physik, Technische Universität Dresden, D-01062, Dresden, Germany

We utilize novel numerical techniques for open quantum systems in order to simulate qubit dynamics in experimentally realized quantum devices. Our approach is based on a recently introduced tensor network based method that efficiently generates auxiliary environments for non-Markovian Gaussian baths [1]. In this framework, the combination of multiple noise sources still has exponential scaling. We overcome this issue by employing a matrix product state representation for the system-and-bath degrees of freedom and then performing real-time evolution via TEBD. As an example problem we consider a recent experiment where a Landau-Zener sweep was performed in a superconducting flux qubit [2]. By carefully taking into account both transverse and longitudinal noise, we reach excellent quantitative agreement with the experimental data over large parameter regimes.

[1] Link, V., Tu, H.H., & Strunz, W. Open Quantum System Dynamics from Infinite Tensor Network Contraction. Phys. Rev. Lett., 132, 200403 (2024)

[2] Lupascu, A. et al. Dissipative Landau-Zener tunneling: crossover from weak to strong environment coupling, arXiv:2207.02017v1 (2022)

Keywords: Dissipative dynamics; Tensor Networks Method; Non-Markovian gaussian baths; Realistic environments