Spin squeezing and light entanglement in Coherent Population Trapping

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We show that strong squeezing and entanglement can be generated at the output of a cavity containing atoms interacting with two fields in a coherent population trapping situation, on account of a nonlinear Faraday effect experienced by the fields close to a dark-state resonance in a cavity. Moreover, the cavity provides a feedback mechanism allowing to reduce the quantum fluctuations of the ground state spin, resulting in strong steady state spin squeezing.
Original languageEnglish
Article number023605
JournalPhysical Review Letters
Number of pages4
Publication statusPublished - 2006

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