Cavity quantum electrodynamics of continuously monitored Bose-condensed atoms

Lee, Mark and Ruostekoski, Janne (2015) Cavity quantum electrodynamics of continuously monitored Bose-condensed atoms. [in special issue: Cavity Quantum Electrodynamics with Ultracold Atoms] Atoms, 3 (3), 450-473. (doi:10.3390/atoms3030450).

Record type: Article

Abstract

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.

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Accepted/In Press date: 11 September 2015

e-pub ahead of print date: 23 September 2015

Published date: 23 September 2015

Keywords: ultracold atoms, cavity quantum electrodynamics, bose–einstein condensates, cavity optomechanics, phonon detection, continuous quantum measurement

Organisations: Applied Mathematics