Maximum Tolerable Excess Noise in Continuous-Variable Quantum Key Distribution

Watch a conference talk from TQC 2023 exploring groundbreaking research on the maximum tolerable excess noise in continuous-variable quantum key distribution (CV-QKD). Learn about a new lower bound for energy-constrained and unconstrained two-way quantum and secret-key capacities of phase-insensitive bosonic Gaussian channels. Discover how this research establishes that entanglement distribution is possible whenever a channel is not entanglement breaking, solving a crucial open problem in quantum communication. Explore an explicit entanglement distribution and distillation protocol that combines recurrence and hashing techniques, with direct applications to determining noise tolerance in optical fibers and free-space quantum communication links. Presented at the 18th Conference on the Theory of Quantum Computation, Communication and Cryptography at the University of Aveiro, this talk delves into theoretical advances that could impact the future development of quantum communication systems without relying on expensive quantum repeaters.