Quantum correlations in position, momentum, and intermediate bases for a full optical field of view

J. Leach, R. E. Warburton, D. G. Ireland, F. Izdebski, S. M. Barnett, A. M. Yao, G. S. Buller, and M. J. Padgett
Phys. Rev. A 85, 013827 – Published 20 January 2012

Abstract

We report an eight-element, linear-array, single-photon detector that uses multiple fibers of differing lengths coupled to a single detector, the timing information from which reveals the position in which the photon was measured. Using two such arrays and two detectors we measure the correlations of photons produced by parametric downconversion, without recourse to mechanical scanning. Spatial light modulators acting as variable focal length lenses positioned between the downconversion crystal and the arrays allow us to switch between measurement of position, transverse momentum, or intermediate bases. We observe the product of the variances of the conditional probabilities for position and momentum to be more than an order of magnitude below the classical limit, realizing a full-field demonstration of the Einstein-Podolsky-Rosen paradox. Such, multistate measurement technologies allow access to the higher information content of the photon based upon spatial modes.

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  • Received 26 July 2011

DOI:https://doi.org/10.1103/PhysRevA.85.013827

©2012 American Physical Society

Authors & Affiliations

J. Leach1, R. E. Warburton2, D. G. Ireland1, F. Izdebski2, S. M. Barnett3, A. M. Yao3, G. S. Buller2, and M. J. Padgett1

  • 1SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
  • 2SUPA, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
  • 3SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom

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Vol. 85, Iss. 1 — January 2012

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