dc.contributor | Perimeter Institute for Theoretical Physics | |
dc.contributor | Universidade Federal do Rio de Janeiro (UFRJ) | |
dc.contributor | Universidade Estadual Paulista (Unesp) | |
dc.contributor | University of Strathclyde | |
dc.contributor | University of Oxford | |
dc.contributor | University of Bristol | |
dc.date.accessioned | 2018-12-11T17:22:40Z | |
dc.date.available | 2018-12-11T17:22:40Z | |
dc.date.created | 2018-12-11T17:22:40Z | |
dc.date.issued | 2018-08-01 | |
dc.identifier | New Journal of Physics, v. 20, n. 8, 2018. | |
dc.identifier | 1367-2630 | |
dc.identifier | http://hdl.handle.net/11449/176828 | |
dc.identifier | 10.1088/1367-2630/aad8df | |
dc.identifier | 2-s2.0-85053112586 | |
dc.identifier | 2-s2.0-85053112586.pdf | |
dc.description.abstract | We develop a unified approach to classical, quantum and post-quantum steering. The framework is based on uncharacterised (black-box) parties performing quantum measurements on their share of a (possibly unphysical) quantum state, and its starting point is the characterisation of general no-signalling assemblages via non-positive local hidden-state models, which will be defined in this work. By developing a connection to entanglement witnesses, this formalism allows for new definitions of families of assemblages, in particular via (i) non-decomposable positive maps and (ii) unextendible product bases. The former proves to be useful for constructing post-quantum assemblages with the built-in feature of yielding only quantum correlations in Bell experiments, while the latter always gives certifiably post-quantum assemblages. Finally, our framework is equipped with an inherent quantifier of post-quantum steering, which we call the negativity of post-quantum steering. We postulate that post-quantum steering should not increase under one-way quantum operations from the steered parties to the steering parties, and we show that, in this sense, the negativity of post-quantum steering is a convex post-quantum-steering monotone. | |
dc.language | eng | |
dc.relation | New Journal of Physics | |
dc.relation | 1,653 | |
dc.rights | Acesso aberto | |
dc.source | Scopus | |
dc.subject | entanglement witnesses | |
dc.subject | EPR steering | |
dc.subject | quantum maps | |
dc.subject | quantum non-locality | |
dc.title | A formalism for steering with local quantum measurements | |
dc.type | Artículos de revistas | |