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00925njm 22002777a 4500 dc Dall’Arno, Michele author Passaro, Elsa author Gallego, Rodrigo author Pawlowski, Marcin author Acín dal Maschio, Antonio author 2015-01-01 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. Postprint (author’s final draft) Àrees temàtiques de la UPC::Física Quantum optics quantum protocols Òptica quàntica Detection loophole attacks on semi-device-independent quantum and classical protocols