Realistic limits on the nonlocality of an N-partite single-photon superposition

Details Realistic limits on the nonlocality of an N-partite single-photon superposition Realistic limits on the nonlocality of an N-partite single-photon superposition

2011-10-26

arxiv.org/abs/1110.5802v2

Physics

Quantum Physics

6 pages, 6 figures

Scientific paper

10.1103/PhysRevA.84.062127

A recent paper [L. Heaney, A. Cabello, M. F. Santos, and V. Vedral, New Journal of Physics, 13, 053054 (2011)] revealed that a single quantum symmetrically delocalized over N modes, namely a W state, effectively allows for all-versus-nothing proofs of nonlocality in the limit of large N. Ideally, this finding opens up the possibility of using the robustness of the W states while realizing the nonlocal behavior previously thought to be exclusive to the more complex class of Greenberger-Horne-Zeilinger (GHZ) states. We show that in practice, however, the slightest decoherence or inefficiency of the Bell measurements on W states will degrade any violation margin gained by scaling to higher N. The non-statistical demonstration of nonlocality is thus proved to be impossible in any realistic experiment.

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