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Cited by 1,374

The DOI matches its Crossref record; 93 of the 93 references it cites were found in a registry or an index.

Fundamental limits of repeaterless quantum communications

Open access
Pirandola, Stefano, Laurenza, Riccardo, Ottaviani, Carlo, Banchi, Leonardo·2017·Nature Communications
DOI 10.1038/ncomms15043
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Abstract

Quantum communications promises reliable transmission of quantum information, efficient distribution of entanglement and generation of completely secure keys. For all these tasks, we need to determine the optimal point-to-point rates that are achievable by two remote parties at the ends of a quantum channel, without restrictions on their local operations and classical communication, which can be unlimited and two-way. These two-way assisted capacities represent the ultimate rates that are reachable without quantum repeaters. Here, by constructing an upper bound based on the relative entropy of entanglement and devising a dimension-independent technique dubbed ‘teleportation stretching’, we establish these capacities for many fundamental channels, namely bosonic lossy channels, quantum-limited amplifiers, dephasing and erasure channels in arbitrary dimension. In particular, we exactly determine the fundamental rate-loss tradeoff affecting any protocol of quantum key distribution. Our findings set the limits of point-to-point quantum communications and provide precise and general benchmarks for quantum repeaters.

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Metadata

Authors
Pirandola, S., Laurenza, R., Ottaviani, C., & Banchi, L.
Venue
Nature Communications
Publisher
Springer Science and Business Media LLC
Published
2017-04-26
Volume
8
Issue
1
Pages
15043-15043
ISSN
2041-1723 (ISSN-L)
DOI
10.1038/ncomms15043
OpenAlex
W2273682834
Cited by
1,374
References
93
FWCI
68.55
Type
journal article
Language
en
Open access
gold

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