Nikola Paunkovic

The use of quantum systems allows for new insights which promise to revolutionize information processing. Quantum cryptography, especially key distribution, has become one of the most prominent applications of quantum technology. However, this task still requires users to be capable of performing quantum operations, such as state preparation or measurements in multiple bases. A natural question, therefore, is can users' technological requirements be reduced? In this work, we experimentally demonstrate a novel quantum key distribution protocol where users are fully classical and quantum operations are only performed by an untrusted third party acting as a server. We derive an information theoretic proof of security for our protocol along with an experimental demonstration.