Roberts, George L., Lucamarini, Marco orcid.org/0000-0002-7351-4622, Dynes, James F. et al. (3 more authors) (2017) Manipulating photon coherence to enhance the security of distributed phase reference quantum key distribution. Applied Physics Letters. 261106. ISSN 0003-6951
Abstract
Distributed-phase-reference (DPR) systems were introduced as a method of decreasing the complexity of quantum key distribution systems for practical use. However, their information-theoretic security has only been proven when the added requirement of block-wise phase randomisation is met. Realisation of this with a conventional approach would result in a cumbersome transmitter, removing any practical advantage held by DPR systems. Here, we solve this problem using a light source that allows the coherence between pulses to be controlled on a pulse-by-pulse basis without the need for additional bulky components. The system is modulator-free, does not require a complex receiver, and features an excellent stability without an active stabilisation mechanism. We achieve megabit per second key rates that are almost three times higher than those obtained with the standard Bennet-Brassard 1984 protocol.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 Author(s) |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 27 Oct 2020 14:50 |
Last Modified: | 24 Nov 2024 00:32 |
Published Version: | https://doi.org/10.1063/1.5004488 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1063/1.5004488 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:167287 |