Degree of entanglement for two qubits

Details Degree of entanglement for two qubits Degree of entanglement for two qubits

2001-09-18

arxiv.org/abs/quant-ph/0109081v2

Phys. Rev. A 64, 050101(R) (2001)

Physics

Quantum Physics

12 pages, no figures

Scientific paper

10.1103/PhysRevA.64.050101

We demonstrate that any pure bipartite state of two qubits may be decomposed into a superposition of a maximally entangled state and an orthogonal factorizable one. Although there are many such decompositions, the weights of the two superposed states are, remarkably, unique. We propose a measure of entanglement based on this decomposition. We also demonstrate that this measure is connected to three measures of entanglement previously set forth: maximal violation of Bell's inequality, concurrence, and two-particle visibility.

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