Spin-squeezing and Dicke state preparation by heterodyne measurement

Details Spin-squeezing and Dicke state preparation by heterodyne measurement Spin-squeezing and Dicke state preparation by heterodyne measurement

2010-02-28

arxiv.org/abs/1003.0157v3

Physical Review A: Atomic, Molecular and Optical Physics 83 (2011) 013821

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.83.013821

We investigate the quantum non-demolition (QND) measurement of an atomic population based on a heterodyne detection and show that the induced back-action allows to prepare both spin-squeezed and Dicke states. We use a wavevector formalism to describe the stochastic process of the measurement and the associated atomic evolution. Analytical formulas of the atomic distribution momenta are derived in the weak coupling regime both for short and long time behavior, and they are in good agreement with those obtained by a Monte-Carlo simulation. The experimental implementation of the proposed heterodyne detection scheme is discussed. The role played in the squeezing process by the spontaneous emission is considered.

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