AI Article Synopsis
- The secret key rate is a major challenge in the practical use of continuous-variable quantum key distribution (CVQKD).
- A new multiplexing scheme is proposed to enhance the secret key rate by using orbital angular momentum (OAM) with a focus on the propagation of vortex beams in turbulent atmospheric conditions.
- Numerical simulations suggest that this OAM multiplexing can significantly boost CVQKD performance, making it a strong candidate for high-rate quantum communication systems.
Article 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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8471551 | PMC |
| http://dx.doi.org/10.3390/e23091187 | DOI Listing |
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