Creation of pure multi-mode entangled states in a ring cavity

Details Creation of pure multi-mode entangled states in a ring cavity Creation of pure multi-mode entangled states in a ring cavity

2009-07-27

arxiv.org/abs/0907.4546v2

Optics Commun. 283 (2010) 814

Physics

Quantum Physics

"Quo vadis Quantum Optics"- special issue of Optics Communications memory of Krzysztof Wodkiewicz

Scientific paper

Practical schemes for creation of multi-mode squeezed (entangled) states of atomic ensembles located inside a high-Q ring cavity are discussed. It is assumed that the cavity is composed of two degenerate mutually counter-propagating modes that can simultaneously couple to the atomic ensembles with the same coupling strengths. The ensembles are composed of ultra-cold atoms which are modeled as four-level systems driven by two laser fields, both co-propagating with one of the cavity directions. We illustrate a procedure that constructs multi-mode squeezed states from the vacuum by a unitary transformation associated with the collective dynamics of the atomic ensembles subjected to driving lasers of a suitably adjusted amplitudes and phases. The lasers pulses together with the cavity dissipation prepare the collective modes in a desired stationary squeezed state.

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