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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 30, Iss. 24 — Dec. 15, 2005
  • pp: 3365–3367

Measurement of the transverse spatial quantum state of light at the single-photon level

Brian J. Smith, Bryan Killett, M. G. Raymer, I. A. Walmsley, and K. Banaszek  »View Author Affiliations

Optics Letters, Vol. 30, Issue 24, pp. 3365-3367 (2005)

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We present an experimental method to measure the transverse spatial quantum state of an optical field in coordinate space at the single-photon level. The continuous-variable measurements are made with a photon-counting, parity-inverting Sagnac interferometer based on all-reflecting optics. The technique provides a large numerical aperture without distorting the shape of the wavefront, does not introduce astigmatism, and allows for characterization of fully or partially coherent optical fields at the single-photon level. Measurements of the transverse spatial Wigner functions for highly attenuated coherent beams are presented and compared with theoretical predictions.

© 2005 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(110.1650) Imaging systems : Coherence imaging
(270.1670) Quantum optics : Coherent optical effects

ToC Category:
Quantum Optics

Brian J. Smith, Bryan Killett, M. G. Raymer, I. A. Walmsley, and K. Banaszek, "Measurement of the transverse spatial quantum state of light at the single-photon level," Opt. Lett. 30, 3365-3367 (2005)

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