Time-reversal and super-resolving phase measurements

We demonstrate phase super-resolution in the absence of entangled states. The key insight is to use the inherent time-reversal symmetry of quantum mechanics: our theory shows that it is possible to measure, as opposed to prepare, entangled states. Our approach is robust, requiring only photons that...

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Bibliographic Details
Published inPhysical review letters Vol. 98; no. 22; p. 223601
Main Authors Resch, K J, Pregnell, K L, Prevedel, R, Gilchrist, A, Pryde, G J, O'Brien, J L, White, A G
Format Journal Article
LanguageEnglish
Published United States 01.06.2007
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Summary:We demonstrate phase super-resolution in the absence of entangled states. The key insight is to use the inherent time-reversal symmetry of quantum mechanics: our theory shows that it is possible to measure, as opposed to prepare, entangled states. Our approach is robust, requiring only photons that exhibit classical interference: we experimentally demonstrate high-visibility phase super-resolution with three, four, and six photons using a standard laser and photon counters. Our six-photon experiment demonstrates the best phase super-resolution yet reported with high visibility and resolution.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.98.223601