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

M. E. Goggin; M. P. Almeida; M. Barbieri; B. P. Lanyon; J. L. O'Brien; A. G. White; G. J. Pryde

doi:10.1073/pnas.1005774108

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

M. E. Goggin, M. P. Almeida, M. Barbieri, B. P. Lanyon, J. L. O'Brien, A. G. White, G. J. Pryde

Research output: Contribution to journal › Article › peer-review

254 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1256-1261
Number of pages	6
Journal	Proceedings of the National Academy of Sciences of the United States of America
Volume	108
Issue number	4
DOIs	https://doi.org/10.1073/pnas.1005774108
Publication status	Published - 25 Jan 2011
Externally published	Yes

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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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AU - Goggin, M. E.

AU - Almeida, M. P.

AU - Barbieri, M.

AU - Lanyon, B. P.

AU - O'Brien, J. L.

AU - White, A. G.

AU - Pryde, G. J.

PY - 2011/1/25

Y1 - 2011/1/25

N2 - 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.

AB - 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.

KW - Entanglement

KW - Quantum communication

KW - Quantum measurement

KW - Quantum nonlocality

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JF - Proceedings of the National Academy of Sciences of the United States of America

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

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