Questions tagged [contextuality]
For questions related to contextuality (a foundational concept in quantum mechanics) as relevant to quantum computing and/or quantum information. Contextuality means that in any theory that attempts to explain quantum mechanics deterministically, the measurement result of a quantum observable depends on the specific experimental setup being used to measure that observable, in particular, the commuting observables being measured with it. (Wikipedia)
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How can one define contextuality within the circuit model?
It is in general believed that contextuality is one of the quantum resource that provides the quantum advantage. A context is usually defined in terms of a set of commuting observables. The quantum ...
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Can the Peres-Mermin square be reframed as a statement on the associated conditional outcome probabilities?
As mentioned in this answer, and links therein (assuming I'm understanding correctly), (non)contextuality can be defined as a property of a given set of conditional probability distributions, that is, ...
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How does quantum contextuality relate to mutually commuting observables?
I am trying to get a better understanding of what is the idea behind quantum contextuality. Quoting from the wikipedia page (emphasis mine):
Quantum contextuality is a foundational concept in ...
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What does negative probability represent?
"Negative energies and probabilities should not be considered as nonsense. They are well-defined concepts mathematically, like a negative of money." -Paul Dirac
The abstract from Photon-phonon-photon ...
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Is it true to say that one qubit in an entangled state can instantaneously affect all others?
When a qubit is measured, there is a ‘collapse of the wave-function’ as a result is randomly chosen.
If the qubit is entangled with others, this collapse will also effect them. And the way it affects ...
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Are there any experimental groups currently measuring quantum contextuality?
I work as a theorist with my current research interests in "quantum contextuality". For those perusing the question, this is essentially a generalization of non-locality where we can show a quantum ...
