Practical quantum tokens without quantum memories and experimental tests
Publication Date
2022Journal Title
npj Quantum Information
ISSN
2056-6387
Publisher
Springer Science and Business Media LLC
Volume
8
Issue
1
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Kent, A., Lowndes, D., Pitalúa-García, D., & Rarity, J. (2022). Practical quantum tokens without quantum memories and experimental tests. npj Quantum Information, 8 (1) https://doi.org/10.1038/s41534-022-00524-4
Description
Funder: UK Quantum Communications Hub grants no. EP/M013472/1 and EP/T001011/1; Perimeter Institute for Theoretical Physics.
Abstract
Unforgeable quantum money tokens were the first invention of quantum
information science, but remain technologically challenging as they require
quantum memories and/or long distance quantum communication. More recently,
virtual 'S-money' tokens were introduced. These are generated by quantum
cryptography, do not require quantum memories or long distance quantum
communication, and yet in principle guarantee many of the security advantages
of quantum money. Here, we describe implementations of S-money schemes with
off-the-shelf quantum key distribution technology, and analyse security in the
presence of noise, losses, and experimental imperfection. Our schemes satisfy
near instant validation without cross-checking. We show that, given standard
assumptions in mistrustful quantum cryptographic implementations,
unforgeability and user privacy could be guaranteed with attainable refinements
of our off-the-shelf setup. We discuss the possibilities for unconditionally
secure (assumption-free) implementations.
Keywords
Article, /639/766/483/481, /639/766/259, article
Sponsorship
EPSRC (via University of York) (EP/M013472/1)
EPSRC (via University of York) (EP/T001011/1)
Identifiers
s41534-022-00524-4, 524
External DOI: https://doi.org/10.1038/s41534-022-00524-4
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334896
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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