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Spin squeezing in a double-pass optical-feedback geometry

Collin Trail, University of New Mexico

(Session 5 : Friday from 5:00-7:00)

Abstract. Squeezed collective atomic spin states can be generated using the Faraday effect, by passing light through an atomic sample twice, imprinting the spin component along the direction of the propagation of light on to the light on the first pass, and rotating the atoms proportionally to this spin component on the second pass, thus creating an effective nonlinearity (M. Takeuchi et al., 2005, Phys. Rev. Lett. 94, 023003). The squeezing produced is reduced by loss of light still entangled to the atoms. We show how this scheme can be improved by a quantum eraser effect, where measuring the light properly reduces it's entanglement to our atomic sample. Furthermore, we present estimates for the reduction in squeezing due to spontaneous emission, by approximating the distribution of the collective variables by a Gaussian.