Cavity-Assisted Generation of Sustainable Macroscopic Entanglement of Ultracold Gases

Atoms

Chaitanya Joshi²  Jonas Larson¹  Jonathan Goldwin³ 

[1] Department of Physics, Stockholm University, Albanova physics center, Se-106 91 Stockholm, Sweden;Department of Physics and York Centre for Quantum Technologies, University of York, Heslington, York YO10 5DD, UK;id="af1-atoms-03-00348">1Department of Physics and York Centre for Quantum Technologies, University of York, Heslington, York YO10 5DD,

关键词: cold atoms;    condensate;    entanglement;    cavity;   

DOI  :  10.3390/atoms3030348

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.