Detector Imperfections in QKD
Shlok Ashok Nahar
The security of Quantum Key Distribution (QKD) protocols is theoretically established using idealised device models. However, the physical implementations upon which practical security relies inevitably deviate from these ideals. We develop a rigorous and versatile framework to address a subclass of such deviations: detector imperfections. This framework, termed ’noise channels’, is independent of security proof technique. This approach recasts imperfections as a quantum channel preceding an idealised measurement process. By granting the eavesdropper control over this channel, the security analysis is simplified to an ideal scenario, with the effects of the imperfections mathematically contained within a well-defined parameter.
Location
QNC 1201