Quantum nonlocality of massive qubits in a moving frame

Abstract

We perform numerical tests on quantum nonlocality of two-level quantum systems (qubits) observed by a uniformly moving observer. Under a suitable momentum setting, the quantum nonlocality of two-qubit nonmaximally entangled states could be weakened drastically by the Lorentz transformation allowing for the existence of local-hidden-variable models, whereas three-qubit genuinely entangled states are robust. In particular, the generalized GHZ state remains nonlocal under arbitrary Wigner rotation and the generalized W state could admit local-hidden-variable models within a rather narrow range of parameters.

6 pages, 4 figures; Minor changes, accepted by PRA

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• Extended Bell inequality and maximum violation
• Measuring outcome correlation for spin-s Bell cat-state and geometric phase induced spin parity effect