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pro vyhledávání: '"Oreshkov, Ognyan"'
Autor:
Kunjwal, Ravi, Oreshkov, Ognyan
Causal inequalities are device-independent constraints on correlations realizable via local operations under the assumption of definite causal order between these operations. While causal inequalities in the bipartite scenario require nonclassical re
Externí odkaz:
http://arxiv.org/abs/2307.02565
Autor:
Hoffreumon, Timothée, Oreshkov, Ognyan
Transformations of transformations, also called higher-order transformations, is a natural concept in information processing, which has recently attracted significant interest in the study of quantum causal relations. In this work, a framework for ch
Externí odkaz:
http://arxiv.org/abs/2206.06206
Publikováno v:
Nature Communications 14, 1471 (2023)
It has been shown that it is theoretically possible for there to exist quantum and classical processes in which the operations performed by separate parties do not occur in a well-defined causal order. A central question is whether and how such proce
Externí odkaz:
http://arxiv.org/abs/2201.11832
Autor:
Castro-Ruiz, Esteban, Oreshkov, Ognyan
Recently there has been much effort in developing a quantum generalisation of reference frame transformations. Despite important progress, a complete understanding of their principles is still lacking. In particular, we argue that previous proposals
Externí odkaz:
http://arxiv.org/abs/2110.13199
Autor:
Hoffreumon, Timothée, Oreshkov, Ognyan
Publikováno v:
Quantum 5, 384 (2021)
We develop an extension of the process matrix (PM) framework for correlations between quantum operations with no causal order that allows multiple rounds of information exchange for each party compatibly with the assumption of well-defined causal ord
Externí odkaz:
http://arxiv.org/abs/2005.04204
Publikováno v:
Nature Communications 12, 885 (2021)
Causal reasoning is essential to science, yet quantum theory challenges it. Quantum correlations violating Bell inequalities defy satisfactory causal explanations within the framework of classical causal models. What is more, a theory encompassing qu
Externí odkaz:
http://arxiv.org/abs/2002.12157
Publikováno v:
Phys. Rev. A 100, 052112 (2019)
We define an uncertainty observable, acting on several replicas of a continuous-variable bosonic state, whose trivial uncertainty lower bound induces nontrivial phase-space uncertainty relations for a single copy of the state. By exploiting the Schwi
Externí odkaz:
http://arxiv.org/abs/1907.09183
It is known that the classical framework of causal models is not general enough to allow for causal reasoning about quantum systems. While the framework has been generalized in a variety of different ways to the quantum case, much of this work leaves
Externí odkaz:
http://arxiv.org/abs/1906.10726
Autor:
Oreshkov, Ognyan
Publikováno v:
Quantum 3, 206 (2019)
It has been shown that it is theoretically possible for there to exist higher-order quantum processes in which the operations performed by separate parties cannot be ascribed a definite causal order. Some of these processes are believed to have a phy
Externí odkaz:
http://arxiv.org/abs/1801.07594
Autor:
Oreshkov, Ognyan, Cerf, Nicolas J.
Publikováno v:
Nature Phys. 11, 853-858 (2015)
The symmetry of quantum theory under time reversal has long been a subject of controversy because the transition probabilities given by Born's rule do not apply backward in time. Here, we resolve this problem within a rigorous operational probabilist
Externí odkaz:
http://arxiv.org/abs/1507.07745