Experimental violation of two-party Leggett-Garg inequalities with semiweak measurements

We generalize the derivation of Leggett-Garg inequalities to systematically treat a larger class of experimental situations by allowing multiparticle correlations, invasive detection, and ambiguous detector results. Furthermore, we show how many such inequalities may be tested simultaneously with a...

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Bibliographic Details
Published in:Physical review letters 2011-01, Vol.106 (4), p.040402-040402, Article 040402
Main Authors: Dressel, J, Broadbent, C J, Howell, J C, Jordan, A N
Format: Article
Language:English
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Summary:We generalize the derivation of Leggett-Garg inequalities to systematically treat a larger class of experimental situations by allowing multiparticle 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 semiweak polarization measurement based on Fresnel reflection. We also point out a nontrivial connection between specific two-party Leggett-Garg inequality violations and convex sums of strange weak values.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.106.040402