Spin squeezing criterion with local unitary invariance
arXiv:quant-ph/0304051 · doi:10.1023/B:QINP.0000004125.12489.f4
Abstract
We propose a new spin squeezing criterion for arbitrary multi-qubit states that is invariant under local unitary operations. We find that, for arbitrary pure two-qubit states, spin squeezing is equivalent to entanglement, and multi-qubit states are entangled if this new spin squeezing parameter is less than 1.
6 pages. Version 3: Small corrections
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Cited by in corpus (11)
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- Effect of phase noise on useful quantum correlations in Bose Josephson junctions
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