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Note that the protocol must be applied solely on Alice's side. Since Bob holds a qubit, the simulation model for dichotomic measurements includes already all projective measurements
- Publisher
- American Physical Society (APS)
- Copyright
- © 2013 American Physical Society
- ISSN
- 0031-9007
- DOI
- 10.1103/PhysRevLett.111.160402
- pmid
- 24182236
- Publisher site
- See Article on Publisher Site
Abstract
The nonlocality of certain quantum states can be revealed by using local filters before performing a standard Bell test. This phenomenon, known as hidden nonlocality, has been so far demonstrated only for a restricted class of measurements, namely, projective measurements. Here, we prove the existence of genuine hidden nonlocality. Specifically, we present a class of two-qubit entangled states, for which we construct a local model for the most general local measurements, and show that the states violate a Bell inequality after local filtering. Hence, there exist entangled states, the nonlocality of which can be revealed only by using a sequence of measurements. Finally, we show that genuine hidden nonlocality can be maximal. There exist entangled states for which a sequence of measurements can lead to maximal violation of a Bell inequality, while the statistics of nonsequential measurements is always local.
Journal
Physical Review Letters – American Physical Society (APS)
Published: Oct 16, 2013