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Cavity Quantum Electrodynamics of Continuously Monitored Bose-Condensed Atoms

Mathematical Sciences, University of Southampton, Southampton SO17 1BJ, UK
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Academic Editors: Jonathan Goldwin and Duncan O’Dell
Atoms 2015, 3(3), 450-473; https://doi.org/10.3390/atoms3030450
Received: 10 July 2015 / Revised: 2 September 2015 / Accepted: 11 September 2015 / Published: 23 September 2015
(This article belongs to the Special Issue Cavity Quantum Electrodynamics with Ultracold Atoms)
We study cavity quantum electrodynamics of Bose-condensed atoms that are subjected to continuous monitoring of the light leaking out of the cavity. Due to a given detection record of each stochastic realization, individual runs spontaneously break the symmetry of the spatial profile of the atom cloud and this symmetry can be restored by considering ensemble averages over many realizations. We show that the cavity optomechanical excitations of the condensate can be engineered to target specific collective modes. This is achieved by exploiting the spatial structure and symmetries of the collective modes and light fields. The cavity fields can be utilized both for strong driving of the collective modes and for their measurement. In the weak excitation limit the condensate–cavity system may be employed as a sensitive phonon detector which operates by counting photons outside the cavity that have been selectively scattered by desired phonons. View Full-Text
Keywords: ultracold atoms; cavity quantum electrodynamics; Bose–Einstein condensates; cavity optomechanics; phonon detection; continuous quantum measurement ultracold atoms; cavity quantum electrodynamics; Bose–Einstein condensates; cavity optomechanics; phonon detection; continuous quantum measurement
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Lee, M.D.; Ruostekoski, J. Cavity Quantum Electrodynamics of Continuously Monitored Bose-Condensed Atoms. Atoms 2015, 3, 450-473.

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