Secret Key Rates and Optimization of BB84 and Decoy State Protocols Over Time-Varying Free-Space Optical Channels
Affiliation
Univ Arizona, Dept Elect & Comp EngnIssue Date
2016-06
Metadata
Show full item recordCitation
Secret Key Rates and Optimization of BB84 and Decoy State Protocols Over Time-Varying Free-Space Optical Channels 2016, 8 (3):1 IEEE Photonics JournalJournal
IEEE Photonics JournalRights
Copyright © 2016, IEEE. Published under an IEEE Open Access Publishing Agreement license.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We optimize secret key rates (SKRs) of weak coherent pulse (WCP)-based quantum key distribution (QKD) over time-varying free-space optical channels affected by atmospheric turbulence. The random irradiance fluctuation due to scintillation degrades the SKR performance of WCP-based QKD, and to improve the SKR performance, we propose an adaptive scheme in which transmit power is changed in accordance with the channel state information. We first optimize BB84 and decoy state-based QKD protocols for different channel transmittances. We then present our adaptation method, to overcome scintillation effects, of changing the source intensity based on channel state predictions from a linear autoregressive model while ensuring the security against the eavesdropper. By simulation, we demonstrate that by making the source adaptive to the time-varying channel conditions, SKRs of WCP-based QKD can be improved up to over 20%.ISSN
1943-0655Version
Final published versionSponsors
Office of Naval Research Multidisciplinary University Research Initiatives ProgramAdditional Links
http://ieeexplore.ieee.org/document/7470562/ae974a485f413a2113503eed53cd6c53
10.1109/JPHOT.2016.2570000