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
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 …