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Experimental demonstration of memory-enhanced quantum communication

Nature (London), 2020-04, Vol.580 (7801), p.60-64 [Peer Reviewed Journal]

COPYRIGHT 2020 Nature Publishing Group ;COPYRIGHT 2020 Nature Publishing Group ;ISSN: 0028-0836 ;EISSN: 1476-4687 ;DOI: 10.1038/s41586-020-2103-5 ;PMID: 32238931

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  • Title:
    Experimental demonstration of memory-enhanced quantum communication
  • Author: Bhaskar, M K ; Riedinger, R ; Machielse, B ; Levonian, D S ; Nguyen, C T ; Knall, E N ; Park, H ; Englund, D ; Lončar, M ; Sukachev, D D ; Lukin, M D
  • Subjects: Mathematical research ; Quantum computing
  • Is Part Of: Nature (London), 2020-04, Vol.580 (7801), p.60-64
  • Description: The ability to communicate quantum information over long distances is of central importance in quantum science and engineering . Although some applications of quantum communication such as secure quantum key distribution are already being successfully deployed , their range is currently limited by photon losses and cannot be extended using straightforward measure-and-repeat strategies without compromising unconditional security . Alternatively, quantum repeaters , which utilize intermediate quantum memory nodes and error correction techniques, can extend the range of quantum channels. However, their implementation remains an outstanding challenge , requiring a combination of efficient and high-fidelity quantum memories, gate operations, and measurements. Here we use a single solid-state spin memory integrated in a nanophotonic diamond resonator to implement asynchronous photonic Bell-state measurements, which are a key component of quantum repeaters. In a proof-of-principle experiment, we demonstrate high-fidelity operation that effectively enables quantum communication at a rate that surpasses the ideal loss-equivalent direct-transmission method while operating at megahertz clock speeds. These results represent a crucial step towards practical quantum repeaters and large-scale quantum networks .
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 0028-0836
    EISSN: 1476-4687
    DOI: 10.1038/s41586-020-2103-5
    PMID: 32238931
  • Source: ProQuest One Psychology
    AUTh Library subscriptions: ProQuest Central
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