Secure quantum signatures using insecure quantum channels

Ryan Amiri, Petros Wallden, Adrian Kent, Erika Andersson

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Abstract

Digital signatures are widely used in modern communication to guarantee authenticity and transferability of messages. The security of currently used classical schemes relies on computational assumptions. We present a quantum signature scheme that does not require trusted quantum channels. We prove that it is unconditionally secure against the most general coherent attacks, and show that it requires the transmission of significantly fewer quantum states than previous schemes. We also show that the quantum channel noise threshold for our scheme is less strict than for distilling a secure key using quantum key distribution. This shows that "direct" quantum signature schemes can be preferable to signature schemes relying on secret shared keys generated using quantum key distribution.

Original languageEnglish
Article number032325
JournalPhysical Review A
Volume93
Issue number3
DOIs
Publication statusPublished - Mar 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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