Fletcher, Alasdair I. and Pirandola, Stefano orcid.org/0000-0001-6165-5615 (2022) Continuous variable measurement device independent quantum conferencing with post-selection. npj Quantum Information. 17329. ISSN 2056-6387
Abstract
A continuous variable (CV), measurement device independent (MDI) quantum key distribution (QKD) protocol is analyzed, enabling three parties to connect for quantum conferencing. We utilise a generalised Bell detection at an untrusted relay and a postselection procedure, in which distant parties reconcile on the signs of the displacements of the quadratures of their prepared coherent states. We derive the rate of the protocol under a collective pure-loss attack, demonstrating improved rate-distance performance compared to the equivalent non-post-selected protocol. In the symmetric configuration in which all the parties lie the same distance from the relay, we find a positive key rate over 6 km. Such postselection techniques can be used to improve the rate of multi-party quantum conferencing protocols at longer distances at the cost of reduced performance at shorter distances.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | 9 pages, 3 figures. © The Author(s) 2022 |
Keywords: | quant-ph |
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: | 19 Oct 2022 11:10 |
Last Modified: | 16 Oct 2024 18:48 |
Published Version: | https://doi.org/10.1038/s41598-022-22251-8 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1038/s41598-022-22251-8 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:192335 |
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Description: Continuous variable measurement device independent quantum conferencing with postselection
Licence: CC-BY 2.5