Zobrazeno 1 - 10
of 350
pro vyhledávání: '"Popescu, Sandu"'
Autor:
Collins, Daniel, Popescu, Sandu
In the paradigmatic example of quantum measurements, whenever one measures a system which starts in a superposition of two states of a conserved quantity, it jumps to one of the two states, implying different final values for the quantity that should
Externí odkaz:
http://arxiv.org/abs/2404.18621
Publikováno v:
PNAS, 120 (41) e2220810120 (2023)
In a recent paper, PNAS, 118, e1921529118 (2021), it was argued that while the standard definition of conservation laws in quantum mechanics, which is of a statistical character, is perfectly valid, it misses essential features of nature and it can a
Externí odkaz:
http://arxiv.org/abs/2401.14261
Publikováno v:
Phys. Rev. A 110, L030201 (2024)
Transfer of conserved quantities between two remote regions is generally assumed to be a rather trivial process: a flux of particles carrying the conserved quantities propagates from one region to another. We however demonstrate a flow of angular mom
Externí odkaz:
http://arxiv.org/abs/2310.07568
Publikováno v:
Quantum 8, 1443 (2024)
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. We argue that studying such objects leads to a better understanding o
Externí odkaz:
http://arxiv.org/abs/2303.17268
Autor:
Holden-Dye, Tom, Popescu, Sandu
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 correlations that can only be achieved if the time ordering between the sy
Externí odkaz:
http://arxiv.org/abs/2101.08739
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 view of no-signalling theories. First, we show that quantum steering in
Externí odkaz:
http://arxiv.org/abs/2007.15502
Akademický článek
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Publikováno v:
Phys. Rev. Lett. 125, 090601 (2020)
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 exchanged between the system and the frame. Here we explore whether thes
Externí odkaz:
http://arxiv.org/abs/1908.02713
Autor:
Gisin, Nicolas, Bancal, Jean-Daniel, Cai, Yu, Remy, Patrick, Tavakoli, Armin, Cruzeiro, Emmanuel Zambrini, Popescu, Sandu, Brunner, Nicolas
Publikováno v:
Nature Communications 11, 2378 (2020)
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 on correlations in networks under the two natural assumptions of no-s
Externí odkaz:
http://arxiv.org/abs/1906.06495
Autor:
Popescu, Sandu
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 quantum state, in between pure states and density matrices.
Externí odkaz:
http://arxiv.org/abs/1811.05472