Roberts, G. L., Lucamarini, M. orcid.org/0000-0002-7351-4622, Dynes, J. F. et al. (3 more authors) (2018) A direct GHz-clocked phase and intensity modulated transmitter applied to quantum key distribution. Quantum Science and Technology. 045010. ISSN 2058-9565
Abstract
Quantum key distribution (QKD), a technology that enables perfectly secure communication, has evolved to the stage where many different protocols are being used in real-world implementations. Each protocol has its own advantages, meaning that users can choose the one best-suited to their application, however each often requires different hardware. This complicates multi-user networks, in which users may need multiple transmitters to communicate with one another. Here, we demonstrate a direct-modulation based transmitter that can be used to implement most weak coherent pulse-based QKD protocols with simple changes to the driving signals. This also has the potential to extend to classical communications, providing a low chirp transmitter with simple driving requirements that combines phase shift keying with amplitude shift keying. We perform QKD with concurrent time-bin and phase modulation, alongside phase randomisation. The acquired data is used to evaluate secure key rates for time-bin encoded BB84 with decoy states and a finite key-size analysis, giving megabit per second secure key rates, 1.60 times higher than if purely phase-encoded BB84 was used.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | quantum communications,quantum cryptography,quantum key distribution |
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 10:10 |
Last Modified: | 16 Oct 2024 17:02 |
Published Version: | https://doi.org/10.1088/2058-9565/aad9bd |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1088/2058-9565/aad9bd |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:167247 |
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