Measurement Device Independent Multi-carrier Continuous Variable Quantum Key Distribution

• Published in: Few-body systems Vol. 63; no. 4
• Main Authors: Salimi, S., Bakhshi, Z.
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01.12.2022; Springer Nature B.V
• Subjects: Atomic; Channels; Communication; Continuity (mathematics); Defects; Denial of service attacks; Hadrons; Heavy Ions; Molecular; Nuclear Physics; Optical and Plasma Physics; Parameter estimation; Particle and Nuclear Physics; Physics; Physics and Astronomy; Protocol; Quantum cryptography; Random variables; Security; Sensors; Third party; Transmittance
• ISSN: 0177-7963; 1432-5411
• DOI: 10.1007/s00601-022-01780-y

The measurement device independent continuous variable quantum key distribution (MDI CV-QKD) is defined to eliminate all security holes that exist due to mismatch between practical systems and their ideal models and imperfections originating from detection. However, up to this moment the practical MDI CV-QKD systems have some inevitable imperfections. In this article we introduced a Multi-carrier mode of the MDI CV-QKD in complex communication environments. Our protocol can defend all detector side channels, which seriously threaten the security of a practical Multi-carrier CV-QKD system. Its security analysis against denial-of-service attack is derived based on the fact that the transmission is through N Gaussian sub-channels with a specific variance. We show the evaluated results when the channel transmittance respectively obeys the uniform and two-point distribution. Then, we analyzed the secret key rate of the MDI Multi-carrier CV-QKD system when the sub-channels transmittance obey the two above distributions. MDI Multi-carrier CV-QKD shows a comparable performance to that of its other counterpart MDI CV-QKD protocols, which will facilitate the simplification and practical implementation of the MDI CV-QKD protocols.