Optimal estimation of two-qubit pure-state entanglement

Details Optimal estimation of two-qubit pure-state entanglement Optimal estimation of two-qubit pure-state entanglement

1999-11-03

arxiv.org/abs/quant-ph/9911008v1

Phys. Rev. A 61, 62307 (2000)

Physics

Quantum Physics

REVTEX, 9 pages, 1 figure

Scientific paper

10.1103/PhysRevA.61.062307

We present optimal measuring strategies for the estimation of the entanglement of unknown two-qubit pure states and of the degree of mixing of unknown single-qubit mixed states, of which N identical copies are available. The most general measuring strategies are considered in both situations, to conclude in the first case that a local, although collective, measurement suffices to estimate entanglement, a non-local property, optimally.

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