Long-Distance Decoy-State Quantum Key Distribution in Optical Fiber
Long-Distance Decoy-State Quantum Key Distribution in Optical Fiber
The theoretical existence of photon-number-splitting attacks creates a security loophole for most quantum key distribution (QKD) demonstrations that use a highly attenuated laser source. Using ultralow-noise, high-efficiency transition-edge sensor photodetectors, we have implemented the first version of a decoy-state protocol that incorporates finite statistics without the use of Gaussian approximations …