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A: Fachverband Atomphysik
A 7: Ultra-cold atoms, ions and BEC I (joint session A/Q)
A 7.1: Vortrag
Dienstag, 15. März 2022, 10:30–10:45, A-H2
Imaging the interface of a qubit and its quantum many-body environment — Sidharth Rammohan1, •Aritra Mishra2, Shiva Kant Tiwari1, Abhijit Pendse1, Anil. K. Chauhan3, Rejish Nath4, Alexander Eisfeld2, and Sebastian Wüster1 — 1Indian Institute of Science Education and Research, Bhopal, India — 2Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 3Palacký University, Olomouc, Czechia — 4Indian Institute of Science Education and Research, Pune, India
Decoherence affects all quantum systems and impedes quantum technologies. In this contribution, we theoretically demonstrate that for a Rydberg atom in a Bose-Einstein condensate, experiments can image the system environment interface that is central for decoherence [1]. High precision absorption images of the condensate can capture transient signals that show real time buildup of the mesoscopic entangled states in the environment. The tuning of the decoherence time scales is possible even from nano seconds to micro seconds using the principle quantum number. As a result, probing is possible even before other sources of decoherence kick in [2]. Finally, we discuss the case in which the system is under a constant microwave drive. This simple modification drastically changes the Hamiltonian as well as the system dynamics, making it non-Markovian, which we study using an advanced numerical technique called the Hierarchy of Pure States [3].
[1] S. Rammohan, et al., (2020), URL https://arxiv.org/abs/2011.11022
[2] S. Rammohan, et al., Phys. Rev. A. 103, 063307 (2021)
[3] D. Suess, et al., Phys. Rev. Lett. 113, 150403 (2014)