SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 13: Ultra-cold atoms, ions, and BEC (joint session A/Q)
Q 13.22: Poster
Mittwoch, 22. September 2021, 16:30–18:30, P
Imaging the interface of a qubit and its quantum-many-body environment — •Sidharth Rammohan1, S.K. Tiwari1, A. Mishra1, A. Pendse1, A.K. Chauhan1,2, R. Nath3, A. Eisfeld4, and S. Wüster1 — 1Department of Physics, Indian Institute of Science Education and Research, Bhopal, MP, India — 2Department of Optics, Faculty of Science, Palacky University, 17.listopadu, Czech Republic — 3Department of Physics, Indian Institute of Science Education and Research, Pune, India — 4Max Planck Institute for the Physics of Complex Systems, Dresden, Germany
We show that two major facets of the decoherence paradigm are experimentally accessible for a single impurity atom embedded in a Bose-Einstein condensate when the impurity is brought into an electronic superposition of two Rydberg states. Not only can the electronic decoherence of the Rydberg atom be read out by microwave interferometry, the platform also provides unique access to the accompanying entangled state of the environment. We theoretically demonstrate signatures of the latter in total atom densities during the transient time in which the impurity is becoming entangled with the medium but the resultant decoherence is not complete yet. The Rydberg impurity thus provides a handle to initiate and read-out mesoscopically entangled superposition states of Bose atom clouds affecting about 500 condensate atoms. We find that the timescale for its creation and decoherence can be tuned from the order of nanoseconds to microseconds by choice of the excited Rydberg principal quantum number ν and that Rydberg decoherence dynamics is typically non-Markovian.