High-Rate Continuous-Variable Quantum Key Distribution with Orbital Angular Momentum Multiplexing |
| |
| Authors: | Xinchao Ruan Wenhao Shi Guojun Chen Wei Zhao Hang Zhang Ying Guo |
| |
| Institution: | 1.School of Automation, Central South University, Changsha 410083, China;2.School of Computer Science and Engineering, Changchun University of Technology, Changchun 130012, China;3.Jiangsu Key Construction Laboratory of IoT Application Technology, Taihu University, Wuxi 214064, China;4.School of Computer Science and Engineering, Central South University, Changsha 410083, China; |
| |
| Abstract: | The secret key rate is one of the main obstacles to the practical application of continuous-variable quantum key distribution (CVQKD). In this paper, we propose a multiplexing scheme to increase the secret key rate of the CVQKD system with orbital angular momentum (OAM). The propagation characteristics of a typical vortex beam, involving the Laguerre–Gaussian (LG) beam, are analyzed in an atmospheric channel for the Kolmogorov turbulence model. Discrete modulation is utilized to extend the maximal transmission distance. We show the effect of the transmittance of the beam over the turbulent channel on the secret key rate and the transmission distance. Numerical simulations indicate that the OAM multiplexing scheme can improve the performance of the CVQKD system and hence has potential use for practical high-rate quantum communications. |
| |
| Keywords: | quantum key distribution continuous-variable orbital angular momentum multiplexing |
|
|
