Spin squeezing criterion with local unitary invariance

Details Spin squeezing criterion with local unitary invariance Spin squeezing criterion with local unitary invariance

2003-04-07

arxiv.org/abs/quant-ph/0304051v3

Quantum Information Processing 2 (3), 207-220 (2003).

Physics

Quantum Physics

6 pages. Version 3: Small corrections

Scientific paper

10.1023/B:QINP.0000004125.12489.

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.

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