Generation of two-color continuous variable quantum entanglement at 0.8 and 1.5 μm

Two-color continuous variable quantum entanglement at 0.8 and 1.5 mu m was experimentally demonstrated by using an above-threshold optical parametric oscillator based on a periodically poled KTiOPO4 crystal. The system presented here has potential applications in future quantum information networks, e.g., it can be used to made a connection between a quantum memory device based on alkaline atoms and a quantum communication device based on telecommunication optical fibers. (C) 2010 American Institute of Physics. [doi:10.1063/1.3467045]