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Secure quantum signatures using insecure quantum channels

dc.creatorAmiri, Ryan
dc.creatorWallden, Petros
dc.creatorKent, Adrian Patrick
dc.creatorAndersson, Erika
dc.description.abstractDigital 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.
dc.publisherAmerican Physical Society
dc.publisherPhysical Review A
dc.rightsAttribution-NonCommercial 2.0 UK: England & Wales
dc.titleSecure quantum signatures using insecure quantum channels

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