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

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

2005-07-14

arxiv.org/abs/quant-ph/0507142v1

Physics

Quantum Physics

3 pages, 2 figures

Scientific paper

10.1364/OL.30.003365

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 wave front, 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 to theoretical predictions.

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