Mountogiannakis, Alexander G., Papanastasiou, Panagiotis, Braverman, Boris et al. (1 more author) (2022) Composably secure data processing for Gaussian-modulated continuous variable quantum key distribution. Physical Review Research. 013099. ISSN 2643-1564
Abstract
Continuous-variable (CV) quantum key distribution (QKD) employs the quadratures of a bosonic mode to establish a secret key between two remote parties, and this is usually achieved via a Gaussian modulation of coherent states. The resulting secret key rate depends not only on the loss and noise in the communication channel, but also on a series of data processing steps that are needed for transforming shared correlations into a final string of secret bits. Here we consider a Gaussian-modulated coherent-state protocol with homodyne detection in the general setting of composable finite-size security. After simulating the process of quantum communication, the output classical data is post-processed via procedures of parameter estimation, error correction, and privacy amplification. In particular, we analyze the high signal-to-noise regime which requires the use of high-rate (non-binary) low-density parity check codes. We implement all these steps in a Python-based library that allows one to investigate and optimize the protocol parameters to be used in practical experimental implementations of short-range CV-QKD.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Accepted version. The code for data-processing is available on github at https://github.com/softquanta/homCVQKD |
Keywords: | quant-ph,physics.app-ph,physics.comp-ph,physics.data-an |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Computer Science (York) |
Depositing User: | Pure (York) |
Date Deposited: | 07 Dec 2021 13:30 |
Last Modified: | 25 Dec 2024 00:26 |
Published Version: | https://doi.org/10.1103/PhysRevResearch.4.013099 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevResearch.4.013099 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:181308 |
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Filename: 2103.16589v3.pdf
Description: 2103.16589v3
Filename: PhysRevResearch.4.013099.pdf
Description: Composably secure data processing for Gaussian-modulated continuous-variable quantum key distribution
Licence: CC-BY 2.5