Violation of the Leggett–Garg inequality with weak measurements of photons
Identifieur interne : 001B44 ( Pmc/Corpus ); précédent : 001B43; suivant : 001B45Violation of the Leggett–Garg inequality with weak measurements of photons
Auteurs : M. E. Goggin ; M. P. Almeida ; M. Barbieri ; B. P. Lanyon ; J. L. O Rien ; A. G. White ; G. J. PrydeSource :
- Proceedings of the National Academy of Sciences of the United States of America [ 0027-8424 ] ; 2011.
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.
Url:
DOI: 10.1073/pnas.1005774108
PubMed: 21220296
PubMed Central: 3029769
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PMC:3029769Le document en format XML
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<series><title level="j">Proceedings of the National Academy of Sciences of the United States of America</title>
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<front><div type="abstract" xml:lang="en"><p>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.</p>
</div>
</front>
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<pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Proc Natl Acad Sci U S A</journal-id>
<journal-id journal-id-type="hwp">pnas</journal-id>
<journal-id journal-id-type="pmc">pnas</journal-id>
<journal-id journal-id-type="publisher-id">PNAS</journal-id>
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<issn pub-type="ppub">0027-8424</issn>
<issn pub-type="epub">1091-6490</issn>
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<article-id pub-id-type="publisher-id">201005774</article-id>
<article-id pub-id-type="doi">10.1073/pnas.1005774108</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Physical Sciences</subject>
<subj-group><subject>Physics</subject>
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<title-group><article-title>Violation of the Leggett–Garg inequality with weak measurements of photons</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Goggin</surname>
<given-names>M. E.</given-names>
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<xref ref-type="aff" rid="aff1"><sup>a</sup>
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<xref ref-type="aff" rid="aff2"><sup>b</sup>
</xref>
<xref ref-type="corresp" rid="cor1"><sup>1</sup>
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<contrib contrib-type="author"><name><surname>Almeida</surname>
<given-names>M. P.</given-names>
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<xref ref-type="aff" rid="aff1"><sup>a</sup>
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<contrib contrib-type="author"><name><surname>Barbieri</surname>
<given-names>M.</given-names>
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<xref ref-type="aff" rid="aff1"><sup>a</sup>
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<xref ref-type="aff" rid="aff3"><sup>c</sup>
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<contrib contrib-type="author"><name><surname>Lanyon</surname>
<given-names>B. P.</given-names>
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<xref ref-type="aff" rid="aff1"><sup>a</sup>
</xref>
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<contrib contrib-type="author"><name><surname>O’Brien</surname>
<given-names>J. L.</given-names>
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<xref ref-type="aff" rid="aff4"><sup>d</sup>
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<contrib contrib-type="author"><name><surname>White</surname>
<given-names>A. G.</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>a</sup>
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<contrib contrib-type="author"><name><surname>Pryde</surname>
<given-names>G. J.</given-names>
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<xref ref-type="aff" rid="aff5"><sup>e</sup>
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<aff id="aff1"><label>a</label>
Department of Physics and Centre for Quantum Computer Technology, University of Queensland, Brisbane 4072, Australia;</aff>
<aff id="aff2"><label>b</label>
Physics Department, Truman State University, Kirksville, MO 63501;</aff>
<aff id="aff3"><label>c</label>
Groupe d’Optique Quantique, Laboratoire Charles Fabry, Institut d’Optique—Graduate School, F91127 Palaiseau Cedex, France;</aff>
<aff id="aff4"><label>d</label>
Centre for Quantum Photonics, H. H. Wills Physics Laboratory, and Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol, BS8 1UB, United Kingdom; and</aff>
<aff id="aff5"><label>e</label>
Centre for Quantum Dynamics and Centre for Quantum Computer Technology, Griffith University, Brisbane, 4111, Australia</aff>
</contrib-group>
<author-notes><corresp id="cor1"><sup>1</sup>
To whom correspondence should be addressed. E-mail: <email>mgoggin@truman.edu</email>
.</corresp>
<fn fn-type="edited-by"><p>Edited by Yakir Aharonov, Tel Aviv University, Tel Aviv, Israel, and approved December 15, 2010 (received for review April 28, 2010)</p>
</fn>
<fn fn-type="participating-researchers"><p>Author contributions: M.E.G., M.P.A., M.B., B.P.L., J.L.O., A.G.W., and G.J.P. designed research; M.E.G., M.P.A., and M.B. performed research; M.E.G., M.P.A., M.B., B.P.L., and G.J.P. analyzed data; and M.E.G., M.P.A., M.B., B.P.L., J.L.O., A.G.W., and G.J.P. wrote the paper.</p>
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<pub-date pub-type="ppub"><day>25</day>
<month>1</month>
<year>2011</year>
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<pub-date pub-type="epub"><day>10</day>
<month>1</month>
<year>2011</year>
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<volume>108</volume>
<issue>4</issue>
<fpage>1256</fpage>
<lpage>1261</lpage>
<self-uri xlink:title="pdf" xlink:type="simple" xlink:href="pnas.1005774108.pdf"></self-uri>
<abstract><p>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.</p>
</abstract>
<kwd-group><kwd>entanglement</kwd>
<kwd>quantum communication</kwd>
<kwd>quantum nonlocality</kwd>
<kwd>quantum measurement</kwd>
</kwd-group>
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