We report the experimental point-by-point sampling of the Wigner function for nonclassical states created in an ultrafast pulsed type-II parametric down-conversion source. We use a loss-tolerant time-multiplexed detector based on a fiber-optical setup and a pair of photon-number-resolving avalanche photodiodes. By capitalizing on an expedient data-pattern tomography, we assess the properties of the light states with outstanding accuracy. The method allows us to reliably infer the squeezing of genuine two-mode states without any phase reference.
@article{arxiv.1603.06938,
title = {Local sampling of the Wigner function at telecom wavelength with loss-tolerant detection of photon statistics},
author = {G. Harder and Ch. Silberhorn and J. Rehacek and Z. Hradil and L. Motka and B. Stoklasa and L. L. Sanchez-Soto},
journal= {arXiv preprint arXiv:1603.06938},
year = {2016}
}