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Detection loophole attacks on semi-device-independent quantum and classical protocols Dall’Arno, Michele Passaro, Elsa Gallego, Rodrigo Pawlowski, Marcin Acín dal Maschio, Antonio Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques Àrees temàtiques de la UPC::Física Quantum optics quantum protocols Òptica quàntica 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) 2015-01-01 Article 1533-7146 https://hdl.handle.net/2117/78576 eng http://www.rintonpress.com/journals/qiconline.html#v15n12 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain 13 P. application/pdf Rinton Press