Yeong Deok Han, Taeseung Choi
We have studied how relativistic causality limits on the generalization of quantum probability assignment, which can give more nonlocal (superquantum) correlations than quantum correlations. We have shown that 'no causal order' condition between two spacelike separate events is stronger than no faster-than-light-signaling condition as the requirement of relativistic causality. Using no causal order condition we have proved that Born rule is the only probability assignment to quantum measurement on an arbitrary entangled quantum state described by the Hilbert space language, consistent with relativistic causality. We have also shown that all superquantum correlations, which preserve relativistic causality, can be understood as hypothetical correlations given by applying modified quantum probability assignments to quantum measurements on a Bell state.
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http://arxiv.org/abs/1307.2026
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