Multi-User Continuous-Variable Quantum Key Distribution with Discrete Modulation

While Quantum Key Distribution is mainly examined in the two-user scenario, modern telecommunication networks consist of multiple nodes. In this poster, we present our recent results, where we try to generalize results for two users to the multi-user case, extending the works of Refs. [1,2,3,4].

[1] "Asymptotic Security Analysis of Discrete-Modulated Continuous-Variable Quantum Key Distribution", Jie Lin, Twesh Upadhyaya, and Norbert Lütkenhaus, Phys. Rev. X 9, 041064 (2019)

[2] "Dimension Reduction in Quantum Key Distribution for Continuous- and Discrete-Variable Protocols", Twesh Upadhyaya, Thomas van Himbeeck, Jie Lin, and Norbert Lütkenhaus
PRX Quantum 2, 020325 (2021)

[3] "Optimizing Continuous-Variable Quantum Key Distribution with Phase-Shift Keying Modulation and Postselection", Florian Kanitschar and Christoph Pacher, Phys. Rev. Applied 18, 034073 (2022)

[4] "Finite-Size Security for Discrete-Modulated Continuous-Variable Quantum Key Distribution Protocols", F. Kanitschar, I. George, J. Lin, T. Upadhyaya and N. Lütkenhaus, PRX Quantum 4, 040306 (2023)