Quantum information theory is built upon the realisation that quantum resources such as superposition and entanglement can be exploited for novel or enhanced ways of processing, encoding and manipulating information, such as quantum cryptography, teleportation, and quantum computing. We now know that there is potentially much more beyond entanglement behind the power of quantum processors. There are more general forms of quantum correlations, which have been identified in almost all quantum states, can survive up to high temperatures and macroscopic scales, and have been linked to the speed-up of quantum devices over classical ones in the presence of noise and to an enhanced precision in metrological settings. Their presence represents, among other things, a signature that quantumness extends far beyond the microworld. In this Colloquium I will give an overview of the current quest for a proper understanding and characterisation of the border between classical and quantum correlations in composite systems, and provide an outlook of the different applications in which quantumness beyond entanglement looks fit to play a key role.

报告人简介: Gerardo Adesso is an Associate Professor at the University of Nottingham (UK) and the head of the Quantum Correlations group, http://quantumcorrelations.weebly.com. He obtained his PhD from the University of Salerno (Italy) in 2007. He joined Nottingham in 2009 after postdoctoral positions in Salerno, Rome and Barcelona. His main interests are in the characterisation, quantification and operational interpretation of quantum correlations in composite systems, including entanglement, nonlocality, steering, and discord. He has contributed significantly to the development of quantum information theory with Gaussian states of continuous variable systems. He has published over 90 articles, delivered over 60 invited talks, and attracted over 2000 citations.