Long-distance continuous-variable measurement-device-independent quantum key distribution with postselection
We introduce a robust scheme for long-distance continuous-variable (CV) measurement-device-independent (MDI) quantum key distribution in which we employ postselection between distant parties communicating through the medium of an untrusted relay. We perform a security analysis that allows for genera...
| Prif Awduron: | , , , , |
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| Fformat: | Erthygl |
| Iaith: | English |
| Cyhoeddwyd: |
American Physical Society
2020-09-01
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| Cyfres: | Physical Review Research |
| Mynediad Ar-lein: | http://doi.org/10.1103/PhysRevResearch.2.033424 |
| Crynodeb: | We introduce a robust scheme for long-distance continuous-variable (CV) measurement-device-independent (MDI) quantum key distribution in which we employ postselection between distant parties communicating through the medium of an untrusted relay. We perform a security analysis that allows for general transmissivity and thermal noise variance of each link, in which we assume that an eavesdropper performs a collective attack and controls the excess thermal noise in the channels. The introduction of postselection enables the parties to sustain a secret key rate over distances exceeding those of existing CV MDI protocols. In the worst-case scenario in which the relay is positioned equidistant between them, we find that the parties may communicate securely over a range of 14 km in standard optical fiber. Our protocol helps to overcome the rate-distance limitations of previously proposed CV MDI protocols while maintaining many of their advantages. |
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| ISSN: | 2643-1564 |