title: Experimental violation of two-party Leggett-Garg inequalities with semiweak measurements.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.
authors.forename: J
authors.initials: J
authors.lastname: Dressel
authors.forename: C J
authors.initials: CJ
authors.lastname: Broadbent
authors.forename: J C
authors.initials: JC
authors.lastname: Howell
authors.forename: A N
authors.initials: AN
authors.lastname: Jordan