Violation of Bell's inequalities implies distillability for N qubits

Details Violation of Bell's inequalities implies distillability for N qubits Violation of Bell's inequalities implies distillability for N qubits

2001-12-18

arxiv.org/abs/quant-ph/0112102v3

J. Phys. A: Math. Gen. 36, L21 (2003)

Physics

Quantum Physics

6 pages, 3 figures, REVTEX. List of authors extended. Partially rewritten, a rather qualitative explanation of the results. Co

Scientific paper

10.1088/0305-4470/36/2/101

We consider quantum systems composed of $N$ qubits, and the family of all Bell's correlation inequalities for two two-valued measurements per site. We show that if a $N$-qubit state $\rho$ violates any of these inequalities, then it is at least bipartite distillable. Indeed there exists a link between the amount of Bell's inequality violation and the degree of distillability. Thus, we strengthen the interpretation of Bell's inequalities as detectors of useful entanglement.

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