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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.
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Contributor : Marco Barbieri <>
Submitted on : Tuesday, September 13, 2011 - 3:24:32 PM
Last modification on : Wednesday, September 16, 2020 - 5:38:33 PM


  • HAL Id : hal-00623095, version 1



Michael Goggin, Marcelo Almeida, Marco Barbieri, Benjamin Lanyon, Jeremy O'Brien, et al.. Violation of the Leggett-Garg inequality with weak measurements of photons. Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2011, 108 (4), pp.1256-1261. ⟨hal-00623095⟩



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