Comment on “Resilience of gated avalanche photodiodes against bright illumination attacks in quantum cryptography” [Appl. Phys. Lett. 98, 231104 (2011)]

摘要: The peculiar properties of quantum mechanics enable possibilities not allowed by classical physics. In particular, two parties can generate a random, secret key at distance, even though an eavesdropper do anything permitted the laws Measuring signals generating key, would ultimately change them, and thus reveal eavesdropper’s presence. This exchange is known as cryptography. Quantum cryptography be, has been proven unconditionally secure using perfect devices. However, when implemented, one must use components available with current technology. These are usually imperfect. Although security for certain imperfections, question remains: be implemented in provable, way, technology? thesis contains both theoretical, experimental contribution to answer this question. On side, used in, complete systems have carefully examined loopholes. it turned out that commercial contained loopholes, which allow capture full without exposing her Furthermore, detector control attack could applicable against variety implementations protocols. theoretical consists proofs very general setting. Precisely, arbitrary individual imperfections source detectors. should make possible wide array imperfect devices Finally, detection scheme proposed, immune compatible those proofs. Therefore, if correctly, offers provable security.