Making and breaking entanglement-based QKD - Antia Lamas Linares

I will describe the basic QKD platform used in Singapore and a number of the experiments that have been performed on top of that. Our system is entanglement-based and uses the polarization degree of freedom for encoding. It is a small, robust platform that is easily adaptable and we have used it to perform field implementations of BBM92, device independent QKD and daylight free space QKD. Finally, I will discuss recent results on system vulnerabilities. A complete key recovery by a malicious eavesdropper using the "faked states" attack was demonstrated in the field, and raises some questions on the security of the physical devices used in quantum cryptography.