Quantum cryptography and its certification against attacks (WHY2025)

I briefly explain quantum cryptography. It is unbreakable in principle, but its real implementations have vulnerabilities arising from equipment imperfections. Certification standards [1] and accredited labs are being established that can test commercial products for these flaws. I explain how we have analysed a commercial quantum key distribution system for loopholes, patched them, and designed tests for the certification lab [2]. [1] ISO/IEC 23837-2:2023(en) international standard. [2] V. Makarov et al., Phys. Rev. Appl. 22, 044076 (2024), https://arxiv.org/abs/2310.20107 Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://program.why2025.org/why2025/talk/DFCBQD/