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Bound entanglement maximally violating Bell inequalities: quantum entanglement is not equivalent to quantum security

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arxiv quant-ph/0405187 v2 pith:LD2CTTBA submitted 2004-05-30 quant-ph

Bound entanglement maximally violating Bell inequalities: quantum entanglement is not equivalent to quantum security

classification quant-ph
keywords entanglementbellboundquantuminequalitiesinequalitymaximallysecurity
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It is shown that Smolin four-qubit bound entangled states [Phys. Rev. A, 63 032306 (2001)] can maximally violate two-setting Bell inequality similar to standard CHSH inequality. Surprisingly this entanglement does not allow for secure key distillation, so neither entanglement nor violation of Bell inequalities implies quantum security. It is also pointed out how that kind of bound entanglement can be useful in reducing communication complexity.

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