Symmetric Extendability of Quantum States and the Extreme Limits of Quantum Key Distribution

Quantum information;Quantum cryptography

Khatri, Sumeet

University of Waterloo

关键词: Quantum information;    Quantum cryptography;   

Others  :  https://uwspace.uwaterloo.ca/bitstream/10012/10993/3/Khatri_Sumeet.pdf

瑞士|英语

来源: UWSPACE Waterloo Institutional Repository

【 摘 要 】

We investigate QKD protocols with two-way classical post-processing that are based on the well-known six-state and BB84 signal states. In these QKD protocols, the source (Alice) sends quantum signals to the receiver (Bob), who measures them, leaving only classical data on both sides. Our goal is to find the highest value of the quantum bit-error rate (QBER) $Q$ for which two-way classical post-processing protocols on the data can distill secret keys. Using the BB84 signal states, such protocols currently exist for $Q