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Security Analysis of Quantum Key Distribution with Small Block Length and Its Application to Quantum Space Communications
- Source :
- Physical review letters. 126(10)
- Publication Year :
- 2020
-
Abstract
- The security of real-world quantum key distribution (QKD) critically depends on the number of data points the system can collect in a fixed time interval. To date, state-of-the-art finite-key security analyses require block lengths in the order of 1E4 bits to obtain positive secret keys. This requirement, however, can be very difficult to achieve in practice, especially in the case of entanglement-based satellite QKD systems, where the overall channel loss can go up to 70 dB or more. Here, we provide an improved finite-key security analysis which can reduce the block length requirement by 14% to 17% for standard channel and protocol settings. In practical terms, this reduction could save entanglement-based satellite QKD weeks of measurement time and resources, thereby bringing space-based QKD technology closer to reality. As an application, we use the improved analysis to show that the recently reported Micius QKD satellite is capable of generating positive secret keys with a $1E-5$ security level.<br />Comment: Revised draft; 5 pages, 1 figure. We warmly welcome comments/corrections, as well as suggestions for additional areas to study
- Subjects :
- Discrete mathematics
Security analysis
Quantum Physics
Computer science
General Physics and Astronomy
Order (ring theory)
FOS: Physical sciences
Quantum entanglement
Interval (mathematics)
Quantum key distribution
Quantum spacetime
01 natural sciences
Reduction (complexity)
0103 physical sciences
010306 general physics
Security level
Quantum Physics (quant-ph)
Block (data storage)
Communication channel
Subjects
Details
- ISSN :
- 10797114
- Volume :
- 126
- Issue :
- 10
- Database :
- OpenAIRE
- Journal :
- Physical review letters
- Accession number :
- edsair.doi.dedup.....b144852bd9d0d8450407e7fda3b8c607