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Conference on Lasers and Electro-Optics

Atomic squeezing and quantum memory in a three-level system

Aurélien Dantan, M. Pinard, P. R. Berman

Published Jan 1, 2004• 0 citations
Publisher

Abstract

We study theoretically different schemes to generate long lived atomic squeezed states via the interaction between fields and an atomic ensemble in cavity. Spin squeezing may be achieved using coherent fields or squeezed vacuum fields
DOI
10.1364/iqec.2004.itui32

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We investigate the generation of entanglement (spin squeezing) in an optical-transition atomic clock through the coupling to an optical cavity in its vacuum state. We show that if each atom is prepared in a superposition of the ground state and a long-lived electronic excited state, and viewed as a spin-1/2 system, then the collective vacuum light shift entangles the atoms, resulting in a squeezed distribution of the ensemble collective spin, without any light applied. This scheme reveals that even an electromagnetic vacuum can constitute a useful resource for entanglement and quantum manipulation. By rotating the spin direction while coupling to the vacuum, the scheme can be extended to implement two-axis twisting resulting in stronger squeezing.