Experimental transmission of quantum digital signatures over 90-km of installed optical fiber using a differential phase shift quantum key distribution system

Abstract

Quantum digital signatures apply quantum mechanics to the problem of guaranteeing message integrity and non-repudiation with information-theoretical security, which are complementary to the confidentiality realized by quantum key distribution. Previous experimental demonstrations have been limited to transmission distances of less than 5-km of optical fiber in a laboratory setting. Here we report the first demonstration of quantum digital signatures over installed optical fiber as well as the longest transmission link reported to date. This demonstration used a 90-km long differential phase shift quantum key distribution system to achieve approximately one signed bit per second - an increase in the signature generation rate of several orders of magnitude over previous optical fiber demonstrations.

References in corpus (2)

• Superconducting nanowire single-photon detectors: physics and applications
• Unconditional security of coherent-state-based differential phase shift quantum key distribution protocol with block-wise phase randomization

Cited by in corpus (8)

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• Protocols for counterfactual and twin-field quantum digital signature
• Towards fully-fledged quantum and classical communication over deployed fiber with up-conversion module
• Signing Information in the Quantum Era