Development of quantum key distribution simulator based on differential-phase-shift protocol

NExT Forum:Quantum communication technology and applications
【講者】 Yuh-Renn Wu, Professor and Chairman, Graduate Institute of Photonics and Optoelectronics, National Taiwan University 吳育任教授兼所長|國立臺灣大學光電工程學研究所
【講題】Development of quantum key distribution simulator based on differential-phase-shift protocol
【摘要】 Quantum key distribution (QKD) is becoming important technology due to the theoretically unconditional secure and identical keys for encrypted communications. In the evaluation of quantum key distribution (QKD), it is important to have a simulator to estimate the performance of the experimental setup. In general, the practical QKD uses the concept of single-photon propagation to avoid eavesdropping. However, due to the high photon loss rate in the system, it is hard for the experimental sides to determine if this loss is from eavesdropping or the system’s propagation loss. In this talk, we will introduce our simulation study on QKD. We have developed a simulation framework that takes a single photon as the system’s basic unit and uses the hybrid model to achieve efficient simulation, including the Monte Carlo method and discrete event simulation. The loss mechanism is based on the quality factor of each connecting device. In addition, for the DPS QKD protocol, we also developed modules for simulating optical wave propagating issues, such as interference, arbitrary waveform, and phase modulation. We also developed a graphical user interface (GUI) that allows users to model customized optical paths to compare the efficiency of different protocols and optimize the parameters to improve the efficiency of key generation. In addition, we use low-density parity check (LDPC) codes for error correction during the reconciliation stage. The development of the QKD simulator enables our experimental teams to evaluate their system design issues and help for finding a better solution in advance.

Co-Organizer:財團法人人工智慧科技基金會AIF 、國家理論科學研究中心物理組NCTS Physics