SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 22: Poster II
Q 22.24: Poster
Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof
Entropy extraction in spinor Bose gases — •Yannick Deller1, Moritz Reh1, Stefan Lannig1, Alexander Schmutz1, David Feiz1, Helmut Strobel1, Martin Gärttner1,2,3, and Markus K. Oberthaler1 — 1Kirchhoff-Institut für Physik, Universität Heidelberg — 2Physikalisches Institut, Universität Heidelberg — 3Institut für Theoretische Physik, Universität Heidelberg
The concept of entropy plays an important role for quantum informational properties of many-body systems. However, experimental extraction of entropies is in general a challenging task due to the rapid increase of the Hilbert space dimension with system size.
As our testbed we use a spin-1 Bose-Einstein condensate of rubidium in a tight optical trap, where we routinely generate non-classical spin states by quantum dynamics after a parameter quench. With a generalized POVM protocol [1], we are able to simultaneously measure two non-commuting spin observables. We extract an entropy using distributions of experimental repetitions with a statistical estimator, that avoids binning and coarse-graining of the data. We discuss how to extend these techniques to multiwell-systems with tunnel-coupling between the wells.
[1] Kunkel et. al., PRL 123, 063603 (2019)