Bell's theorem for general N-qubit states

Details Bell's theorem for general N-qubit states Bell's theorem for general N-qubit states

2001-02-06

arxiv.org/abs/quant-ph/0102039v3

Phys. Rev. Lett. 88 (2002) 210401

Physics

Quantum Physics

4 pages, journal version

Scientific paper

10.1103/PhysRevLett.88.210401

We derive a single general Bell inequality which is a necessary and sufficient condition for the correlation function for N particles to be describable in a local and realistic picture, for the case in which measurements on each particle can be chosen between two arbitrary dichotomic observables. We also derive a necessary and sufficient condition for an arbitrary N-qubit mixed state to violate this inequality. This condition is a generalization and reformulation of the Horodeccy family condition for two qubits.

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