title: Tomographic measurement of joint photon statistics of the twin-beam quantum state
abstract: We report the first measurement of the joint photon-number probability distribution for a two-mode quantum state created by a nondegenerate optical parametric amplifier. The measured distributions exhibit up to 1.9 dB of quantum correlation between the signal and idler photon numbers, whereas the marginal distributions are thermal as expected for parametric fluorescence.
authors.affiliation: Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois 60208-3118, USA.
authors.initials: M
authors.lastname: Vasilyev
authors.initials: SK
authors.lastname: Choi
authors.initials: P
authors.lastname: Kumar
authors.initials: GM
authors.lastname: D'Ariano