Device-independent quantum information processing
and quantum cryptography
It was recently discovered that quantum information can be processed in a device-independent way. Specifically, it is possible to perform a protocol such as quantum cryptography, and to guarantee its security, based on experimental data only. That is, no assumptions about the internal working of the devices used in the protocol are required in this approach, therefore termed ‘device-independent’. This represents the ultimate form of security for quantum information processing, and appears as a promising solution for overcoming recent hacking attacks on commercial quantum cryptography devices. Conceptually, this approach also opens novel perspectives on the foundations of quantum theory, a clear understanding of which is still missing today. Our main objective is to develop an intensive and systematic research program on the device-independent approach to quantum theory and quantum information processing. Using tools of quantum information theory, we address questions related to (i) theory/foundations, (ii) applications, and (iii) experiments. The spirit of this research is that all aspects go hand in hand, and that progress in one direction may lead to progress in another. Particular attention is devoted to applied aspects, with a clear focus on their practical implementation. Given the great potential of device-independent protocols, we believe that their experimental implementation, which is still very challenging with today's technology, represents a major avenue for future research.
Self-testing quantum random number generator. Image taken from Lunghi et al. PHYSICAL REVIEW LETTERS 114, 150501 (2015).