A quantum repeater at telecommunications wavelengths with long-lived atomicmemory is proposed, and its critical elements are experimentally demonstratedusing a cold atomic ensemble. Via atomic cascade emission, an entangled pair of1530 nm and 780 nm photons is generated. The former is ideal for long-distancequantum communication, and the latter is naturally suited for mapping to along-lived atomic memory. Together with our previous demonstration ofphotonic-to-atomic qubit conversion, both of the essential elements for theproposed telecommunications quantum repeater have now been realized.
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