Violation of the Leggett-Garg inequality with weak measurements of photons

Details Violation of the Leggett-Garg inequality with weak measurements of photons Violation of the Leggett-Garg inequality with weak measurements of photons

2009-07-09

arxiv.org/abs/0907.1679v1

Proc. Natl. Acad. Sci. U. S. A. 108, 1256 (2011)

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1073/pnas.1005774108

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 non-intrusiveness 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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