Tomographic Measurement of Joint Photon Statistics of the Twin-Beam Quantum State
Michael Vasilyev, Sang-Kyung Choi, Prem Kumar, Giacomo Mauro D’Ariano · Physical Review Letters · 2000
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.