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Realistic limits on the nonlocality of an N-partite single-photon superposition
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0002-2082-9583
2011 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 84, no 6, 062127- p.Article in journal (Refereed) Published
Abstract [en]

A recent paper [L. Heaney, A. Cabello, M. F. Santos, and V. Vedral, New J. Phys. 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 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 nonstatistical demonstration of nonlocality is thus proved to be impossible in any realistic experiment.

Place, publisher, year, edition, pages
2011. Vol. 84, no 6, 062127- p.
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-75540DOI: 10.1103/PhysRevA.84.062127ISI: 000298636100001ScopusID: 2-s2.0-84855280793OAI: diva2:490768
QC 20120206Available from: 2012-02-06 Created: 2012-02-06 Last updated: 2012-02-06Bibliographically approved

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