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A contextual extension of Spekkens toy model
Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-1082-8325
2012 (English)In: AIP Conference Proceedings, ISSN 0094-243X, Vol. 1424Article in journal (Refereed) Published
Abstract [en]

Quantum systems show contextuality. More precisely, it is impossible to reproduce the quantum-mechanical predictions using a non-contextual realist model, i.e., a model where the outcome of one measurement is independent of the choice of compatible measurements performed in the measurement context. There has been several attempts to quantify the amount of contextuality for specific quantum systems, for example, in the number of rays needed in a KS proof, or the number of terms in certain inequalities, or in the violation, noise sensitivity, and other measures. This paper is about another approach: to use a simple contextual model that reproduces the quantum-mechanical contextual behaviour, but not necessarily all quantum predictions. The amount of contextuality can then be quantified in terms of additional resources needed as compared with a similar model without contextuality. In this case the contextual model needs to keep track of the context used, so the appropriate measure would be memory. Another way to view this is as a memory requirement to be able to reproduce quantum contextuality in a realist model. The model we will use can be viewed as an extension of Spekkens toy model [Phys. Rev. A 75, 032110 (2007)], and the relation is studied in some detail. To reproduce the quantum predictions for the Peres-Mermin square, the memory requirement is more than one bit in addition to the memory used for the individual outcomes in the corresponding noncontextual model.

Place, publisher, year, edition, pages
AIP American Institute of Physics , 2012. Vol. 1424
Keyword [en]
Contextuality; Quantum Mechanics; Hidden Variables; Finite State Machine
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-87981DOI: 10.1063/1.3688973ISI: 000302768800028OAI: diva2:601002
Available from: 2013-01-28 Created: 2013-01-28 Last updated: 2016-08-31

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Larsson, Jan-Åke
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Information CodingThe Institute of Technology
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