



01468nas a2200157   4500008004100000245005700041210005600098260001200154300001400166490000700180520103700187100001601224700001701240700001601257856003701273       2020                        eng d00aParallel Device-Independent Quantum Key Distribution0 aParallel DeviceIndependent Quantum Key Distribution  c09/2020  a5567-55840 v663 a<p>A prominent application of quantum cryptography is the distribution of cryptographic keys that are provably secure. Such security proofs were extended by Vazirani and Vidick ( Physical Review Letters , 113, 140501, 2014) to the device-independent (DI) scenario, where the users do not need to trust the integrity of the underlying quantum devices. The protocols analyzed by them and by subsequent authors all require a sequential execution of N multiplayer games, where N is the security parameter. In this work, we prove the security of a protocol where all games are executed in parallel. Besides decreasing the number of time-steps necessary for key generation, this result reduces the security requirements for DI-QKD by allowing arbitrary information leakage of each user&rsquo;s inputs within his or her lab. To the best of our knowledge, this is the first parallel security proof for a fully device-independent QKD protocol. Our protocol tolerates a constant level of device imprecision and achieves a linear key rate.</p>1 aJain, Rahul1 aMiller, Carl1 aShi, Yaoyun  uhttps://arxiv.org/abs/1703.05426