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Contextuality, Cohomology and Paradox

• Samson Abramsky, Rui Soares Barbosa, Kohei Kishida, Raymond Lal, Shane Mansfield
• CSL
• 2015

Contextuality is a key feature of quantum mechanics that provides an important non-classical resource for quantum information and computation. Abramsky and Brandenburger used sheaf theory to give a general treatment of contextuality in quantum theory [New Journal of Physics 13 (2011) 113036]. However, contextual phenomena are found in other fields as well,… (More)

Generalised phase kick-back: the structure of computational algorithms from physical principles

• Ciarán M Lee, John H Selby, +8 authors Malte C Tichy
• 2016

Density cubes and higher-order interference theories B Daki , T Paterek and Brukner A framework for phase and interference in generalized probabilistic theories Abstract The advent of quantum computing has challenged classical conceptions of which problems are efficiently solvable in our physical world. This motivates the general study of how physical… (More)

No ψ-epistemic model can fully explain the indistinguishability of quantum states.

• Jonathan Barrett, Eric G Cavalcanti, Raymond Lal, Owen J E Maroney
• Physical review letters
• 2014

According to a recent no-go theorem [M. Pusey, J. Barrett and T. Rudolph, Nat. Phys. 8, 475 (2012)], models in which quantum states correspond to probability distributions over the values of some underlying physical variables must have the following feature: the distributions corresponding to distinct quantum states do not overlap. In such a model, it… (More)

Time asymmetry of probabilities versus relativistic causal structure: an arrow of time.

• Bob Coecke, Raymond Lal
• Physical review letters
• 2012

There is an incompatibility between the symmetries of causal structure in relativity theory and the signaling abilities of probabilistic devices with inputs and outputs: while time reversal in relativity will not introduce the ability to signal between spacelike separated regions, this is not the case for probabilistic devices with spacelike separated… (More)

Possibilities Determine the Combinatorial Structure of Probability Polytopes

• Samson Abramsky, Rui Soares Barbosa, Kohei Kishida, Raymond Lal, Shane Mansfield
• ArXiv
• 2016

We study the set of no-signalling empirical models on a measurement scenario, and show that the combinatorial structure of the no-signalling polytope is completely determined by the possibilistic information given by the support of the models. This is a special case of a general result which applies to all polytopes presented in a standard form, given by… (More)

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