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Cavity-Assisted Generation of Sustainable Macroscopic Entanglement of Ultracold Gases
Stockholm University, Faculty of Science, Department of Physics. Universität zu Köln, Germany.
Number of Authors: 2
2015 (English)In: Atoms, ISSN 2218-2004, Vol. 3, no 3, 348-366 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 3, no 3, 348-366 p.
Keyword [en]
cold atoms, condensate, entanglement, cavity
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-123862DOI: 10.3390/atoms3030348ISI: 000363981600005OAI: oai:DiVA.org:su-123862DiVA: diva2:878356
Available from: 2015-12-08 Created: 2015-12-08 Last updated: 2015-12-08Bibliographically approved

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