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State-independent test of quantum contextuality with either single photons or coherent light
npj Quantum Information, 2021 Contextuality is a phenomenon at the heart of quantum mechanics different from classical behavior and has been recently identified as a resource in quantum information processing. Experimental demonstration of contextuality is thus an important goal.
Dengke Qu +4 more
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Bounding and Simulating Contextual Correlations in Quantum Theory
PRX Quantum, 2021 We introduce a hierarchy of semidefinite relaxations of the set of quantum correlations in generalized contextuality scenarios. This constitutes a simple and versatile tool for bounding the magnitude of quantum contextuality.
Armin Tavakoli +3 more
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Noise-robust preparation contextuality shared between any number of observers via unsharp measurements [PDF]
Quantum, 2021 Multiple observers who independently harvest nonclassical correlations from a single physical system share the system's ability to enable quantum correlations.
Hammad Anwer +5 more
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Contextuality in Classical Physics and Its Impact on the Foundations of Quantum Mechanics
Entropy, 2021 It is shown that the hallmark quantum phenomenon of contextuality is present in classical statistical mechanics (CSM). It is first shown that the occurrence of contextuality is equivalent to there being observables that can differentiate between pure and
Fritiof Wallentin
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Single-Photon Quantum Contextuality on a Chip. [PDF]
ACS Photonics, 2017 In classical physics, properties of the objects exist independently on the context, i.e. whether and how measurements are performed. Quantum physics showed this assumption to be wrong and that Nature is indeed "contextual". Contextuality has been observed in the simplest physical systems such as single particles, and plays fundamental roles in quantum ...
Crespi A +9 more
europepmc +11 more sources
CONTEXTUAL DETERMINISTIC QUANTUM MECHANICS [PDF]
International Journal of Modern Physics B, 2000 We present a simple proof of quantum contextuality for a spinless particle with a one-dimensional configuration space. We then discuss how the maximally realistic deterministic quantum mechanics recently constructed by this author and V. Singh can be applied to different contexts.
openaire +2 more sources
Popper, Bohr et la contextualité de la mécanique quantique
Philosophia Scientiæ, 2021 During his intellectual life, Karl Popper blamed Niels Bohr for defending subjectivist theses about Quantum Mechanics and for introducing the concept of subject in physics. But Popper’s accusation contradicts Bohr’s texts.
Sébastien Poinat
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Contextuality and Wigner function negativity in qubit quantum computation [PDF]
, 2017 We describe a scheme of quantum computation with magic states on qubits for which contextuality is a necessary resource possessed by the magic states.
Bermejo-Vega, Juan +4 more
core +3 more sources
Quantum measurements and contextuality [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2019 In quantum physics, the term ‘contextual’ can be used in more than one way. One usage, here called ‘Bell contextual’ since the idea goes back to Bell, is that if A , B and C are three quantum observables, with A compatible (i.e. commuting) with
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