Measurement schemes for the spin quadratures on an ensemble of atoms
arXiv:0905.1197 · doi:10.1007/s00340-011-4717-7
Abstract
We consider how to measure collective spin states of an atomic ensemble based on the recent multi-pass approaches for quantum interface between light and atoms. We find that a scheme with two passages of a light pulse through the atomic ensemble is efficient to implement the homodyne tomography of the spin state. Thereby, we propose to utilize optical pulses as a phase-shifter that rotates the quadrature of the spins. This method substantially simplifies the geometry of experimental schemes.
4pages 2 figures
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