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Quantum secrecy in thermal states II

Newton, E; Ghesquiere, A; Wilson, FL; Guiazon, RF; Varcoe, BTH; Moseley, M; (2020) Quantum secrecy in thermal states II. Journal of Physics B: Atomic, Molecular and Optical Physics , 53 (20) , Article 205502. 10.1088/1361-6455/aba7e9. Green open access

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Abstract

In this paper we consider a scheme for cryptographic key distribution based on a variation of continuous variable quantum key distribution called central broadcast. In the continuous variable central broadcast scheme, security arises from discord present in the Hanbury Brown and Twiss effect from a thermal source. The benefit of this scheme is that it expands the range of frequencies into the microwave regime. Longer wavelengths—where the thermal photon number is higher and correlations remain robust over long distances—may even be preferable to optical wavelengths. Assuming that Alice controls the source but not the distribution of the light (e.g. satellite broadcasts), then we demonstrate that the central broadcast scheme is robust to an entangling cloner attack. We establish the security of the protocol both experimentally and theoretically.

Type: Article
Title: Quantum secrecy in thermal states II
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1361-6455/aba7e9
Publisher version: https://doi.org/10.1088/1361-6455/aba7e9
Language: English
Additional information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (https://creativecommons.org/licenses/by/4.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10112796
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