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Realistic limits on the nonlocality of an<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi></mml:math>-partite single-photon superposition
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 …