3.1k citations · 18k across the 110 of their papers we have counts for
111 papers
Classical-to-quantum non-signalling boxes
Carolina Moreira Ferrera, Robin Simmons, James Purcell +2
Here we introduce the concept of classical input - quantum output (C-Q) non-signalling boxes, a generalisation of the classical input - classical output (C-C) non-signalling boxes.…
Indefinite global time
Tom Holden-Dye, Sandu Popescu
By studying the set of correlations that are theoretically possible between physical systems without allowing for signalling of information backwards in time, we here identify corr…
Blind steering in no-signalling theories
Emmanuel Zambrini Cruzeiro, Nicolas Gisin, Sandu Popescu
Steering is a physical phenomenon which is not restricted to quantum theory, it is also present in more general, no-signalling theories. Here, we study steering from the point of v…
Reference frames which separately store non-commuting conserved quantities
Sandu Popescu, Ana Belén Sainz, Anthony J. Short +1
Even in the presence of conservation laws, one can perform arbitrary transformations on a system if given access to a suitable reference frame, since conserved quantities may be ex…
Constraints on nonlocality in networks from no-signaling and independence
Nicolas Gisin, Jean-Daniel Bancal, Yu Cai +5
Generalising the concept of Bell nonlocality to networks leads to novel forms of correlations, the characterization of which is however challenging. Here we investigate constraints…
Quantum states and knowledge: Between pure states and density matrices
Sandu Popescu
In this note I will present a subtle interplay between density matrices and the knowledge about their preparation, and I will argue that there is a need to consider a new type of q…