Secret Key Rates and Optimization of BB84 and Decoy State Protocols over Time-Varying Free-Space Optical Channels

Xiaole Sun; Ivan B. Djordjevic; Mark A. Neifeld

doi:10.1109/JPHOT.2016.2570000

Secret Key Rates and Optimization of BB84 and Decoy State Protocols over Time-Varying Free-Space Optical Channels

Xiaole Sun, Ivan B. Djordjevic, Mark A. Neifeld

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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%.

Original language	English (US)
Article number	7470562
Journal	IEEE Photonics Journal
Volume	8
Issue number	3
DOIs	https://doi.org/10.1109/JPHOT.2016.2570000
State	Published - Jun 2016

Keywords

Quantum key distribution
free-space optical communication
source adaptation

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

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