Secure Communications and Verification

Over the past year, we have developed a new kind of protocol for quantum communication, which we call “device-independent”. The idea is that in a device-independent protocol, the users will still be secure , even if the quantum devices they are using are compromised by errors in manufacture or a deliberate backdoor. We have developed device-independent quantum protocols for the transmission of secret messages, and also for a slightly different problem where a user needs to verify that an untrusted quantum device is behaving as it should. We are working with NQIT researchers in Oxford, who are building the hardware that will be able to implement these new protocols