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Practical quantum digital signature with a gigahertz BB84 quantum key distribution system
Optics Letters
|January 16, 2019
Summary
This study demonstrates a stable and efficient quantum digital signature (QDS) system using a BB84 quantum key distribution (QKD) setup. The novel interferometer design achieves high speeds and a practical signature rate, advancing QDS applications.
Area of Science:
- Quantum Information Science
- Quantum Cryptography
- Experimental Physics
Background:
- Quantum digital signatures (QDS) offer information-theoretical security for message integrity and non-repudiation.
- Previous QDS protocols have been realized using various quantum key distribution (QKD) systems.
Purpose of the Study:
- To experimentally demonstrate a QDS protocol using a BB84 QKD system.
- To develop a stable and high-speed QDS device for practical applications.
Main Methods:
- Implementation of a QDS protocol on a BB84 QKD system.
- Design of an asymmetric Faraday-Sagnac-Michelson interferometer for enhanced stability.
- Experimental testing with a 25 km installed fiber and 25 dB channel loss.
Main Results:
- Achieved a signature rate of 0.044 bit/s at a security level of 10^-10.
- Demonstrated high speed operation with a gigahertz repetition rate.
- The designed interferometer proved intrinsically stable against channel disturbance.
Conclusions:
- The developed QDS device is stable, efficient, and operates at high speeds.
- This work represents a significant step towards the practical implementation of quantum digital signatures.
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