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. and Pryde, G. J. (2011) Violation of the Leggett-Garg inequality with weak measurements of photons. Proceedings of the National Academy of Sciences of USA, 108 4: 1256-1261. doi:10.1073/pnas.1005774108

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Author Goggin, M. E.
Almeida, M. P.
Barbieri, M.
Lanyon, B. P.
O'Brien, J. L.
White, A. G.
Pryde, G. J.
Title Violation of the Leggett-Garg inequality with weak measurements of photons
Journal name Proceedings of the National Academy of Sciences of USA   Check publisher's open access policy
ISSN 0027-8424
1091-6490
Publication date 2011-01-25
Sub-type Article (original research)
DOI 10.1073/pnas.1005774108
Volume 108
Issue 4
Start page 1256
End page 1261
Total pages 6
Place of publication Washington, D. C., U.S.A.
Publisher National Academy of Sciences
Collection year 2012
Language eng
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.
Keyword Entanglement
Quantum communication
Quantum nonlocality
Quantum measurement
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Proceedings of the National Academy of Sciences of the United States of America (PNAS)

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Centre for Quantum Computer Technology Publications
Official 2012 Collection
 
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Created: Tue, 08 Feb 2011, 09:34:32 EST by Professor Andrew White on behalf of School of Mathematics & Physics