Detection loophole attacks on semi-device-independent quantum and classical protocols
Michele Dall’Arno, Elsa Passaro, Rodrigo Gallego, Marcin Pawłowski, Antonio Acín · Quantum Information and Computation · 2015
Semi-device-independent quantum protocols realize information tasks -- e.g. secure key distribution, random access coding, and randomness generation -- in a scenario where no assumption on the internal working of the devices used in the protocol is made, except their dimension. These protocols offer two main advantages: first, their implementation is often less demanding than fully-device-independent protocols. Second, they are more secure than their device-dependent counterparts. Their classical analogous is represented by random access codes, which provide a general framework for describing one-sided classical communication tasks. We discuss conditions under which detection inefficiencies can be exploited by a malicious provider to fake the performance of semi-device-independent quantum and classical protocols -- and how to prevent it.