Anqi Huang - IQC
Quantum key distribution (QKD) is able to achieve information-theoretic security in principle. However, in practice, imperfect devices threaten the security of quantum cryptographic systems. As a promising countermeasure against practical attacks, measurement-device-independent (MDI) QKD is immune to all detector side-channel attacks. Nevertheless, there are some limitations of the MDI QKD protocol. To overcome the technical limitations of MDI QKD, I scrutinized and evaluated other two countermeasures against imperfect detections. On the other hand, MDI QKD assumes that the source is trustable. To verify this assumption, I investigated the practical security of source in QKD systems. The study during my Ph.D. indicates the importance of continuing practical security investigation for MDI QKD systems and other quantum cryptographic systems.