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Distinguishing Bohmian contextuality from Kochen-Specker contextuality

arXiv Quantum Physics
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⚡ Quantum Brief
Researchers Anton Skott and Jan-Åke Larsson challenge the assumed link between Bohmian and Kochen-Specker (KS) contextuality in quantum mechanics, publishing their findings in May 2026. The study distinguishes two types of quantum contextuality: KS (where outcomes depend on jointly performed measurements) and Bohmian (where outcomes rely on device specifics beyond the model state). Contrary to prior claims, the authors prove Bohmian contextuality isn’t required for KS contextuality to emerge in hidden-variable models. They demonstrate this using the 2022 Contextual Ontological Model (COM), which exhibits KS contextuality while lacking Bohmian contextuality, as outcomes derive solely from the model state. This separation enables independent analysis of both contextuality types, advancing foundational quantum theory research.
Distinguishing Bohmian contextuality from Kochen-Specker contextuality

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Quantum Physics arXiv:2605.24446 (quant-ph) [Submitted on 23 May 2026] Title:Distinguishing Bohmian contextuality from Kochen-Specker contextuality Authors:Anton Skott, Jan-Åke Larsson View a PDF of the paper titled Distinguishing Bohmian contextuality from Kochen-Specker contextuality, by Anton Skott and Jan-{\AA}ke Larsson View PDF HTML (experimental) Abstract:Quantum contextuality is a concept used to describe the property of hidden-variable theory that measurement outcomes predetermined by the hidden variables depend on the measurement context. The term measurement context can have different meanings, giving rise to different flavours of quantum contextuality. The first discovered flavour is Kochen-Specker (KS) contextuality where measurement outcomes will depend on what compatible measurements are jointly performed with the selected measurement. Another flavour, here to be compared with KS contextuality, is that referred to in Bohmian mechanics where outcomes of some specific measurements are not completely specified by the model state, but depend also on specifics of the measurement device used. It has been claimed that this type of Bohmian contextuality is necessary to enable KS contextuality in a hidden variable model. In this paper we show that this is not the case. The recently proposed Contextual Ontological Model (COM) [Hindlycke and Larsson, Phys. Rev. Lett. 2022] produces KS contextual predictions but does not have the Bohmian contextuality; the outcome of every measurement allowed by COM can be predicted from the model state itself. This distinguishes Bohmian contextuality from KS contextuality, and enables individual study of the two concepts. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2605.24446 [quant-ph] (or arXiv:2605.24446v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2605.24446 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Jan-Åke Larsson [view email] [v1] Sat, 23 May 2026 07:35:18 UTC (79 KB) Full-text links: Access Paper: View a PDF of the paper titled Distinguishing Bohmian contextuality from Kochen-Specker contextuality, by Anton Skott and Jan-{\AA}ke LarssonView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-05 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv (What is alphaXiv?) Links to Code Toggle CatalyzeX Code Finder for Papers (What is CatalyzeX?) DagsHub Toggle DagsHub (What is DagsHub?) GotitPub Toggle Gotit.pub (What is GotitPub?) Huggingface Toggle Hugging Face (What is Huggingface?) ScienceCast Toggle ScienceCast (What is ScienceCast?) Demos Demos Replicate Toggle Replicate (What is Replicate?) Spaces Toggle Hugging Face Spaces (What is Spaces?) Spaces Toggle TXYZ.AI (What is TXYZ.AI?) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower (What are Influence Flowers?) Core recommender toggle CORE Recommender (What is CORE?) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs. Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)

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Source: arXiv Quantum Physics