280-km experimental demonstration of quantum digital signature with one decoy state

• URL: http://arxiv.org/abs/2003.00420v1
• Date: Sun, 1 Mar 2020 06:50:20 GMT
• Title: 280-km experimental demonstration of quantum digital signature with one decoy state
• Abstract summary: Quantum digital signature (QDS) guarantee the unforgeability, nonrepudiation and transferability of signature messages with information-theoretical security. In this paper, we report a proof-of-principle phase-encoding QDS demonstration using only one decoy state. We have successfully achieved higher signature rate, e.g., 0.98 bit/s at 103 km, and to date a record-breaking transmission distance over 280-km installed fibers.
• Score: 19.122089539191492
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum digital signature (QDS) guarantee the unforgeability, nonrepudiation and transferability of signature messages with information-theoretical security, and hence has attracted much attention recently. However, most previous implementations of QDS showed relatively low signature rates or/and short transmission distance. In this paper, we report a proof-of-principle phase-encoding QDS demonstration using only one decoy state. Firstly, such method avoids the modulation of vacuum state, thus reducing experimental complexity and random number consumption. Moreover, incorporating with low-loss asymmetric Mach-Zehnder interferometers and real-time polarization calibration technique, we have successfully achieved higher signature rate, e.g., 0.98 bit/s at 103 km, and to date a record-breaking transmission distance over 280-km installed fibers. Our work represents a significant step towards real-world applications of QDS.

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