Physics – Quantum Physics
Scientific paper
2011-11-08
Phys. Rev. A 85, 024101 (2012)
Physics
Quantum Physics
4 pages, 2 figures. v2: updated reference. v3: published version
Scientific paper
10.1103/PhysRevA.85.024101
Quantum theory allows for correlations between the outcomes of distant measurements that are inconsistent with any locally causal theory, as demonstrated by the violation of a Bell inequality. Typical demonstrations of these correlations require careful alignment between the measurements, which requires distant parties to share a reference frame. Here, we prove, following a numerical observation by Shadbolt et al., that if two parties share a Bell state and each party randomly chooses three orthogonal measurements, then the parties will always violate a Bell inequality. Furthermore, we prove that this probability is highly robust against local depolarizing noise, in that small levels of noise only decrease the probability of violating a Bell inequality by a small amount. We also show that generalizing to N parties increases the robustness against noise. These results improve on previous ones that only allowed a high probability of violating a Bell inequality for large numbers of parties.
Bartlett Stephen D.
Wallman Joel J.
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