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Bulletin of the American Physical Society

Experimental violation of a Bell-Leggett-Garg inequality using weak measurements, Part II: The Violation

T. White, J. Mutus, Justin Dressel, J. Kelly, R. Barends, A. Megrant, Evan R. Jeffrey, D. Sank, B. Campbell, Y. Chen, Zongqiang CHEN, Benjamin Chiaro, A. Dunsworth, Austin G. Fowler, I.-C. Hoi, C. Neill, P. J. J. O’Malley, P. Roushan, Chris Quintana, A. Vainsencher, J. Wenner, Alexander N. Korotkov, A.N. Cleland, John M. Martinis

Published Mar 5, 2015• 0 citations
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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.