Journal of Electronic Science and Technology | 2021
Impact of fiber dispersion on the performance of entanglement-based dispersive optics quantum key distribution
Abstract
Abstract Dispersive optics quantum key distribution (DO-QKD) based on energy-time entangled photon pairs is an important QKD scheme. In DO-QKD, the arrival time of photons are used in key generation and security analysis, which would be greatly affected by fiber dispersion. In this work, we established a theoretical model of entanglement-based DO-QKD system, considering the protocol, physical processes such as fiber transmission and single-photon detection, and the analysis of security test. Based on this theoretical model, we investigated the influence of chromatic dispersion introduced by transmission fibers on the performance of DO-QKD. By analyzing the benefits and costs of dispersion compensation, the system performance under G.652 and G.655 optical fibers are shown respectively. The results show that dispersion compensation is not necessary in DO-QKD systems in campus networks and even metro networks. Whereas, it is still required in DO-QKD systems with longer fiber transmission distance.