Ryan Amiri

Oblivious transfer (OT) is a cryptographic primitive which is universal for multiparty computation. Unfortunately, perfect information-theoretically secure (ITS) quantum oblivious transfer is impossible. Imperfect information-theoretically secure quantum oblivious transfer is possible, but the smallest possible cheating probabilities are not known. We present an imperfect information-theoretically secure quantum oblivious transfer protocol with no restrictions on dishonest parties, and its experimental implementation. The cheating probabilities are 0.75 and 0.729 for sender and receiver respectively, which is lower than in existing protocols. Using a photonic test-bed, we have implemented the protocol with honest parties, as well as optimal cheating strategies.