title: Violation of the Leggett-Garg inequality with weak measurements of photons.
abstract: By weakly measuring the polarization of a photon between two strong polarization measurements, we experimentally investigate the correlation between the appearance of anomalous values in quantum weak measurements and the violation of realism and nonintrusiveness of measurements. A quantitative formulation of the latter concept is expressed in terms of a Leggett-Garg inequality for the outcomes of subsequent measurements of an individual quantum system. We experimentally violate the Leggett-Garg inequality for several measurement strengths. Furthermore, we experimentally demonstrate that there is a one-to-one correlation between achieving strange weak values and violating the Leggett-Garg inequality.
authors.affiliation: Department of Physics and Centre for Quantum Computer Technology, University of Queensland, Brisbane 4072, Australia. mgoggin@truman.edu
authors.forename: M E
authors.initials: ME
authors.lastname: Goggin
authors.forename: M P
authors.initials: MP
authors.lastname: Almeida
authors.forename: M
authors.initials: M
authors.lastname: Barbieri
authors.forename: B P
authors.initials: BP
authors.lastname: Lanyon
authors.forename: J L
authors.initials: JL
authors.lastname: O'Brien
authors.forename: A G
authors.initials: AG
authors.lastname: White
authors.forename: G J
authors.initials: GJ
authors.lastname: Pryde
mesh_terms: D000465:Algorithms; D008962:Models, Theoretical; D017785:Photons; D055585:Physical Phenomena; D011789:Quantum Theory