Security of quantum key distribution with bit and basis dependent detector flaws (pp0060-0076)
          Lars Lydersen and Johannes Skaar
          doi: https://doi.org/10.26421/QIC10.1-2-5
Abstracts: We consider the security of the Bennett-Brassard 1984 (BB84) protocol for Quantum Key Distribution (QKD), in the presence of bit and basis dependent detector flaws. We suggest a powerful attack that can be used in systems with detector efficiency mismatch, even if the detector assignments are chosen randomly by Bob. A security proof is provided, valid for any basis dependent, possibly lossy, linear optical imperfections in the channel/receiver/detectors. The proof does not assume the so-called squashing detector model.
Key words: Quantum cryptography, quantum key distribution, security proof, detection efficiency mismatch