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Experimental Violation of Two-Party Leggett-Garg Inequalities with Semi-weak Measurements

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arxiv 1101.4917 v1 pith:PVSKO6SD submitted 2011-01-25 quant-ph

Experimental Violation of Two-Party Leggett-Garg Inequalities with Semi-weak Measurements

classification quant-ph
keywords inequalitiesleggett-gargexperimentalsemi-weaktwo-partyallowingambiguousbiphoton
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We generalize the derivation of Leggett-Garg inequalities to systematically treat a larger class of experimental situations by allowing multi-particle correlations, invasive detection, and ambiguous detector results. Furthermore, we show how many such inequalities may be tested simultaneously with a single setup. As a proof of principle, we violate several such two-particle inequalities with data obtained from a polarization-entangled biphoton state and a semi-weak polarization measurement based on Fresnel reflection. We also point out a non- trivial connection between specific two-party Leggett-Garg inequality violations and convex sums of strange weak values.

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