Security of Differential Phase Shift QKD from Relativistic Principles

Learn about the first complete security proof of the differential phase shift (DPS) QKD protocol in this conference talk from TQC 2023. Explore how relativistic principles and quantum information theory combine to demonstrate security against general attacks, including finite-size effects, in quantum key distribution. Delve into the practical challenges of implementing quantum protocols with current optical telecommunication technology while maintaining theoretical security. Understand how the security of DPS QKD reduces to a relativistic protocol and discover why coherent attacks prove stronger than collective attacks in this context. Follow along as the presentation covers the basic setup, channels, squashing techniques, key rates, security attack scenarios, and limitations of this groundbreaking approach that bridges a 20-year gap in quantum cryptography research.