Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 2: Quantum Thermodynamics and Open Quantum Systems

QI 2.2: Vortrag

Montag, 5. September 2022, 10:00–10:15, H9

Quantum thermodynamics of rare earth spin ensembles embedded into Y₂SiO₅ — Andreas Meyer^1,2, Rudolf Gross^1,2,3, and •Nadezhda P. Kukharchyk^1,3 — ¹Walther-Meissner-Institut, Bavarian Academy of Sciences, Garching, Germany — ²Physics Department, Technical University of Munich, Garching, Germany — ³Munich Center for Quantum Science and Technologies, Munich, Germany

Interest in the field of quantum thermodynamic has emerged recently supported by advances in quantum information field. While quantum systems themselves require an optimized approach for characterisation of entropy and work, also the temperature range at which such systems operate is highly sensitive to even small excitation. The rare earth spin ensembles belong to those systems, which are in the focus of quantum thermodynamics. When these ensembles are cooled down to millikelvin temperatures, even short controlling pulses result in a strong perturbation of thermal equilibrium in the host crystal, which reveals itself in the observed dynamics of the excited spin ensemble [1]. In this talk, we will discuss the dynamics of the non-equilibrium state within the Y₂SiO₅ crystal, as well as its impact on the relaxation and decoherence processes within the rare earth spin ensembles. The analytical modelling of the heat dynamics will be compared to the experimental finding of the coherence study of ¹⁶⁷Er:Y₂SiO₅ at millikelvin temperatures.

1. N. Kukharchyk et al, "Enhancement of optical coherence in ¹⁶⁷Er:Y₂SiO₅ crystal at millikelvin temperatures", arXiv: 1910.03096