Abstract
We consider how to measure collective spin states of an atomic ensemble based on the 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.
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Namiki, R., Tanaka, SIR., Takano, T. et al. Measurement schemes for the spin quadratures on an ensemble of atoms. Appl. Phys. B 105, 197–201 (2011). https://doi.org/10.1007/s00340-011-4717-7
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DOI: https://doi.org/10.1007/s00340-011-4717-7