Impact of fiber dispersion on the performance of entanglement-based dispersive optics quantum key distribution |
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| Affiliation: | 1. Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China;2. Beijing National Research Center for Information Science and Technology, Tsinghua University, Beijing, 100084, China;3. Beijing Innovation Center for Future Chips, Tsinghua University, Beijing, 100084, China;4. Frontier Science Center for Quantum Information, Beijing, 100084, China;5. Beijing Academy of Quantum Information Sciences, Beijing, 100193, China |
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| 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 is used in key generation and security analysis, which would be greatly affected by fiber dispersion. In this work, we established a theoretical model of the entanglement-based DO-QKD system, considering the protocol, physical processes (such as fiber transmission and single-photon detection), and the analysis of security tests. Based on this theoretical model, we investigate 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 unnecessary for DO-QKD systems in campus networks and even metro networks. Whereas, it is still required in DO-QKD systems with longer fiber transmission distances. |
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| Keywords: | Dispersion compensation Dispersive optics quantum key distribution (DO-QKD) Fiber chromatic dispersion Quantum networks |
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