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Flexible quantum tokens in spacetime

Published version
Peer-reviewed

Type

Article

Change log

Authors

Pitalúa-García, D 

Abstract

S-money [Proc. R. Soc. A 475, 20190170 (2019)] schemes define virtual tokens designed for networks with relativistic or other trusted signalling constraints. The tokens allow near-instant verification and guarantee unforgeability without requiring quantum state storage. We present refined two stage S-money schemes. The first stage, which may involve quantum information exchange, generates private user token data. In the second stage, which need only involve classical communications, users determine the valid presentation point, without revealing it to the issuer. This refinement allows the user to determine the presentation point anywhere in the causal past of all valid presentation points. It also allows flexible transfer of tokens among users without compromising user privacy.

Description

Keywords

quant-ph, quant-ph, cs.CR

Journal Title

Physical Review A

Conference Name

Journal ISSN

2469-9926
2469-9934

Volume Title

101

Publisher

American Physical Society (APS)

Rights

All rights reserved
Sponsorship
EPSRC (via University of York) (EP/M013472/1)