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

J. Dressel*, C. J. Broadbent, J. C. Howell, A. N. Jordan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

151 Scopus citations


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.

Original languageAmerican English
Article number040402
JournalPhysical Review Letters
Issue number4
StatePublished - 24 Jan 2011
Externally publishedYes


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