High-rate measurement-device-independent quantum cryptography
By Stefano Pirandola, Carlo Ottaviani, G. Spedalieri, Christian Weedbrook, Samuel L. Braunstein, Seth Lloyd, Tobias Gehring, C. S. Jacobsen, Ulrik Lund Andersen. Nature Photonics, 2013
414 citations recorded by the source corpus.
Quantum cryptography achieves a formidable task—the remote distribution of secret keys by exploiting the fundamental laws of physics. Quantum cryptography is now headed towards solving the practical problem of constructing scalable and secure quantum networks. A significant step in this direction has been the introduction of measurement-device independence, where the secret key between two parties is established by the measurement of an untrusted relay. Unfortunately, although qubit-implemented protocols can reach long distances, their key rates are typically very low, unsuitable for the demands of a metropolitan network. Here we show, theoretically and experimentally, that a solution can come from the use of continuous-variable systems. We design a coherent-state network protocol able to achieve remarkably high key rates at metropolitan distances, in fact three orders of magnitude higher than those currently achieved. Our protocol could be employed to build high-rate quantum networks where devices securely connect to nearby access points or proxy servers. An end-to-end continuous-variable quantum key distribution system with an untrusted node is proposed. A proof-of-principle experiment shows that 10−1 secret key bits per relay use are distributed at 4 dB loss, corresponding to 20 km in optical fibre.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/caabc5dceccca2203eaae42bf8e1c0c9a7bb46f2
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Practical challenges in quantum key distribution (2016, neutral): “112,122 Therefore, for long distance ( 4 30 km) applications, DV MDI-QKD is currently the only option available for MDI-QKD.”
- End-to-end capacities of a quantum communication network (2019, methodology): “For instance, our benchmarks may be used to evaluate performances in relay-assisted QKD protocols such as MDI-QKD and variants 56 – 58 .”
- Distributing Secret Keys with Quantum Continuous Variables: Principle, Security and Implementations (2015, methodology): “Alice and Bob can then update their data using Charlie’s information in order to obtain correlated continuous variables (see [89] for details).”