Photon-number Entanglement in Twin Beams Generated in Spontaneous Parametric Down-conversion.
Jan Peřina, Ondřej Haderka, Martin Hamar, Jan Peřina, Václav Michálek · International Conference on Quantum Information · 2007
Joint signal-idler photon-number distribution and quantum phase-space quasi-distributions are measured for light generated in intense spontaneous parametric down-conversion. Entanglement in the signal- and idler-photon numbers is observed.