Experimental Observation of Quantum Correlations in Modular Variables
arXiv:1208.6222 · doi:10.1103/PhysRevA.86.032332
Abstract
We experimentally detect entanglement in modular position and momentum variables of photon pairs which have passed through -slit apertures. We first employ an entanglement criteria recently proposed in [Phys. Rev. Lett. {\bf 106}, 210501 (2011)], using variances of the modular variables. We then propose an entanglement witness for modular variables based on the Shannon entropy, and test it experimentally. Finally, we derive criteria for Einstein-Podolsky-Rosen-Steering correlations using variances and entropy functions. In both cases, the entropic criteria are more successful at identifying quantum correlations in our data.
7 pages, 4 figures, comments welcome
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