Open AccessHardy’s nonlocality proof using twisted photons
Author(s) -
Lixiang Chen,
Jacquiline Romero
Publication year - 2012
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.021687
Subject(s) - quantum nonlocality , quantum entanglement , physics , spontaneous parametric down conversion , superposition principle , photon , angular momentum , photon entanglement , quantum mechanics , degenerate energy levels , measure (data warehouse) , optics , quantum , computer science , database
Hardy's nonlocality proof is considered as "the best version of Bell's theorem". We report an experimental implementation of this by measuring the orbital angular momentum (OAM) of entangled twisted photon pairs. Two advantages arise from using twisted photons. First, the limited OAM spectrum generated by parametric down-conversion provides a natural set of OAM non-maximally entangled states with selective degrees of entanglement. Second, the measurement of any non-trivial superposition of OAM states can be conveniently done with spatial light modulators. We measure states that are defined on asymmetric OAM Bloch spheres and show results which are incompatible with local realism.