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Atoms 2015, 3(3), 348-366; doi:10.3390/atoms3030348

Cavity-Assisted Generation of Sustainable Macroscopic Entanglement of Ultracold Gases

1
Department of Physics and York Centre for Quantum Technologies, University of York, Heslington,York YO10 5DD, UK
2
Department of Physics, Stockholm University, Albanova physics center, Se-106 91 Stockholm, Sweden
3
Institut für Theoretische Physik, Universität zu Köln, De-50937 Köln, Germany
*
Authors to whom correspondence should be addressed.
Academic Editors: Jonathan Goldwin and Duncan O’Dell
Received: 29 June 2015 / Accepted: 29 July 2015 / Published: 4 August 2015
(This article belongs to the Special Issue Cavity Quantum Electrodynamics with Ultracold Atoms)
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Abstract

Prospects for reaching persistent entanglement between two spatially-separated atomic Bose–Einstein condensates are outlined. The system setup comprises two condensates loaded in an optical lattice, which, in return, is confined within a high-Q optical resonator. The system is driven by an external laser that illuminates the atoms, such that photons can scatter into the cavity. In the superradiant phase, a cavity field is established, and we show that the emerging cavity-mediated interactions between the two condensates is capable of entangling them despite photon losses. This macroscopic atomic entanglement is sustained throughout the time-evolution apart from occasions of sudden deaths/births. Using an auxiliary photon mode and coupling it to a collective quadrature of the two condensates, we demonstrate that the auxiliary mode’s squeezing is proportional to the atomic entanglement, and as such, it can serve as a probe field of the macroscopic entanglement. View Full-Text
Keywords: d atoms; condensate; entanglement; cavity d atoms; condensate; entanglement; cavity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Joshi, C.; Larson, J. Cavity-Assisted Generation of Sustainable Macroscopic Entanglement of Ultracold Gases. Atoms 2015, 3, 348-366.

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