Interpreting concurrence in terms of covariances in a generalized spin star system

Details Interpreting concurrence in terms of covariances in a generalized spin star system Interpreting concurrence in terms of covariances in a generalized spin star system

2006-06-20

arxiv.org/abs/quant-ph/0606163v1

Physics

Quantum Physics

7 pages, 3 figures, submitted to Phys Rev B

Scientific paper

The quantum dynamics of M pairwise coupled spin 1/2 is analyzed and the time evolution of the entanglement get established within a prefixed couple of spins is studied. A conceptual and quantitative link between the concurrence function and measurable quantities is brought to light providing a physical interpretation for the concurrence itself as well as a way to measure it. A generalized spin star system is exactly investigated showing that the entanglement accompanying its rich dynamics is traceable back to the covariance of appropriate commuting observables of the two spins.

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