Spin squeezing and entanglement
Klyachko, Alexander A.
Shumovsky, Alexander S.
Proceedings of the Conference on Coherence and Quantum Optics, CQO 2007
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We reformulate definition of spin squeezing and spin coherence in terms of the total variance in spin operators. We propose a new measure of spin squeezing. We show equivalence of spin squeezing and spin entanglement.