Simplified quantum key distribution implementation secure in the presence of state preparation flaws

作者：Ainhoa Agulleiro, Fadri Grünenfelder, Raphaël Houlmann, Ana Blázquez, Hugo Zbinden, Davide Rusca · 发表于：arXiv (Cornell University) · 年份：2026 · DOI：10.48550/arxiv.2607.06038 · 研究领域：Quantum Information and Cryptography、Advanced Statistical Modeling Techniques、Quantum Mechanics and Applications

We present an implementation of a three-state BB84 protocol with time-bin encoding, one decoy state and a simplified measurement scheme that uses passive basis choice. Our system simplifies the state characterization with respect to previous iterations. We also adapt the loss-tolerant method to our protocol, thus dealing with the measured state preparation flaws. We compare the obtained phase error rate and secret key rate when including the state imperfections and when assuming perfect states. Our results highlight the importance of characterization and implementation security.