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Experimental quantum repeater without quantum memory
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DOI：10.1038/s41566-019-0468-5.png)
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Abstract
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Quantum repeaters-important components of a scalable quantum internet-enable entanglement to be distributed over long distances. The standard paradigm for a quantum repeater relies on the necessary, demanding requirement of quantum memory. Despite significant progress, the limited performance of quantum memory means that making practical quantum repeaters remains a challenge. Remarkably, a proposed all-photonic quantum repeater avoids the need for quantum memory by harnessing the graph states in the repeater nodes. Here we perform an experimental demonstration of an all-photonic quantum repeater. By manipulating a 12-photon interferometer, we implement a 2 x 2 parallel all-photonic quantum repeater, and observe an 89% enhancement of entanglement-generation rate over standard parallel entanglement swapping. These results provide a new approach to designing repeaters with efficient single-photon sources and photonic graph states, and suggest that the all-photonic scheme represents an alternative path-parallel to matter-memory-based schemes-towards realizing practical quantum repeaters.
Keywords:
ENTANGLEMENT PURIFICATION
ATOMIC ENSEMBLES
COMMUNICATION
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