Entropy inequalities and Bell inequalities for two-qubit systems

Details Entropy inequalities and Bell inequalities for two-qubit systems Entropy inequalities and Bell inequalities for two-qubit systems

2003-01-30

arxiv.org/abs/quant-ph/0301171v5

Phys. Rev. A69, 022305 (2004)

Physics

Quantum Physics

Errors corrected. See L. Jakobcyk, quant-ph/0409087

Scientific paper

10.1103/PhysRevA.69.022305

Sufficient conditions for (the non-violation of) the Bell-CHSH inequalities
in a mixed state of a two-qubit system are: 1) The linear entropy of the state
is not smaller than 0.5, 2) The sum of the conditional linear entropies is
non-negative, 3) The von Neumann entropy is not smaller than 0.833, 4) The sum
of the conditional von Neumann entropies is not smaller than 0.280.

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