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Phys Rev Lett. 2001 May 14;86(20):4431-4.

Entanglement and extreme spin squeezing.

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Institute of Physics and Astronomy, University of Aarhus, DK-8000 Arhus C., Denmark.


For any mean value of a Cartesian component of a spin vector we identify the smallest possible uncertainty in any of the orthogonal components. The corresponding states are optimal for spectroscopy and atomic clocks. We show that the results for different spin J can be used to identify entanglement and to quantify the depth of entanglement in systems with many particles. With the procedure developed in this Letter, collective spin measurements on an ensemble of particles can be used as an experimental proof of multiparticle entanglement.

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