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Phys Rev Lett. 2011 Jan 28;106(4):040402. Epub 2011 Jan 24.

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

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Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.


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.

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