Physics – Quantum Physics
Scientific paper
2005-07-14
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.
Banaszek Konrad
Killett Bryan
Raymer Michael G.
Smith Brian J.
Walmsley Ian A.
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