Abstract
Two-color continuous variable quantum entanglement at 0.8 and 1.5 μm 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.
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