Dresden 2026 – scientific programme

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QI: Fachverband Quanteninformation

QI 9: Decoherence and Open Systems I

QI 9.5: Talk

Tuesday, March 10, 2026, 15:00–15:15, BEY/0245

Quantum Memory in Strongly Coupled Systems via Time-Evolving Matrix Product Operators — •Ilja List, Konrad Mickiewicz, Matteo Garbellini, Charlotte Bäcker, and Walter Strunz — Dresden University of Technology, Dresden, Germany

The steady exchange of information and energy between system and environment in open quantum systems introduces noise and dissipation into the dynamics. In the interest of modelling realistic quantum systems, it is crucial to investigate systems strongly coupled to the environment. In such non-Markovian quantum dynamics, the origin of memory effects requires a strict classification as classical or quantum. Using the paradigmatic spin-boson model, we examine numerically the behavior of open quantum systems via local quantum memory criteria based on process tensors [1]. To this end, we use the recently introduced method uniTEMPO [2] to construct the process tensors. We focus on the long-range multi-time correlations of non-Markovian open quantum systems for increasing coupling strength, and investigate the detection of quantum memory near the quantum phase transition.

[1] C. Bäcker, V. Link, and W. T. Strunz. Phys. Rev. Res. 5bfc-znkj (2025)

[2] V. Link, H.-H. Tu, and W. T. Strunz, Phys. Rev. Lett. 132, 200403 (2024)

Keywords: Spin-Boson Model; Non-Markovianity; Quantum Memory; Quantum Dynamics; Time-Evolution Matrix Product Operators (TEMPO)