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

206 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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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.",

keywords = "Entanglement, Quantum communication, Quantum measurement, Quantum nonlocality",

author = "Goggin, {M. E.} and Almeida, {M. P.} and M. Barbieri and Lanyon, {B. P.} and O'Brien, {J. L.} and White, {A. G.} and Pryde, {G. J.}",

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Violation of the Leggett-garg inequality with weak measurements of photons. / Goggin, M. E.; Almeida, M. P.; Barbieri, M.; Lanyon, B. P.; O'Brien, J. L.; White, A. G.; Pryde, G. J.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 108, No. 4, 25.01.2011, p. 1256-1261.

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

TY - JOUR

T1 - Violation of the Leggett-garg inequality with weak measurements of photons

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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JO - National Academy of Sciences, Proceedings

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

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