Device-independent quantum key distribution based on measurement inputs

Understand

We provide an analysis of a new family of device independent quantum key distribution (QKD) protocols with several novel features: (a) The bits used for the secret key do not come from the results of the measurements on an entangled state but from the choices of settings; (b) Instead of a single security parameter (a violation of some Bell inequality) a set of them is used to estimate the level of trust in the secrecy of the key.

• The main advantage of these protocols is a smaller vulnerability to imperfect random number generators made possible by feature (a).
• We prove the security and the robustness of such protocols.
• We show that using our method it is possible to construct a QKD protocol which retains its security even if the source of randomness used by communicating parties is strongly biased.