Modular network for high-rate quantum conferencing

Year: 2019

Authors: Ottaviani C., Lupo C., Laurenza R., Pirandola S.

Autors Affiliation: Univ York, Comp Sci, York YO10 5GH, N Yorkshire, England; Univ York, York Ctr Quantum Technol, York YO10 5GH, N Yorkshire, England; Univ Sheffield, Dept Phys & Astron, Hounsfield Rd, Sheffield S3 7RH, S Yorkshire, England; INO CNR, QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy; LENS, Largo Enrico Fermi 2, I-50125 Florence, Italy; MIT, Res Lab Elect, 77 Massachusetts Ave, Cambridge, MA 02139 USA.

Abstract: One of the main open problems in quantum communication is the design of efficient quantum-secured networks. This is a challenging goal, because it requires protocols that guarantee both unconditional security and high communication rates, while increasing the number of users. In this scenario, continuous-variable systems provide an ideal platform where high rates can be achieved by using off-the-shelf optical components. At the same time, the measurement-device independent architecture is also appealing for its feature of removing a substantial portion of practical weaknesses. Driven by these ideas, here we introduce a modular design of continuous-variable network where each individual module is a measurement-device-independent star network. In each module, the users send modulated coherent states to an untrusted relay, creating multipartite secret correlations via a generalized Bell detection. Using one-time pad between different modules, the network users may share a quantum-secure conference key over arbitrary distances at constant rate.

Journal/Review: COMMUNICATIONS PHYSICS

Volume: 2      Pages from: 118-1  to: 118-6

More Information: This work was supported by the EPSRC via the ’UK Quantum Communications Hub’ (EP/M013472/1), the European Union’s Horizon 2020 research and innovation program under grant agreement No 820466 (CiViQ), and the Innovation Fund Denmark via the Quantum Innovation Center Qubiz.
KeyWords: Key Distribution; Communication; Information; Discrete
DOI: 10.1038/s42005-019-0209-6

Citations: 29
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