4 papers · 1 filter
A Quantum Algorithm For Computing Contextuality Bounds
Colm Kelleher, Frédéric Holweck
Quantum contextuality is a limitation on deterministic hidden variable models, testable in measurement scenarios where outcomes differ under quantum or classical descriptions due t…
Memory cost of quantum contextuality with Pauli observables
Stefan Trandafir, Colm Kelleher, Adán Cabello
Classically simulating the quantum contextual correlations produced by sequences of ideal measurements of compatible observables requires the measured system to have an internal me…
Empirical Demonstration of Quantum Contextuality on NISQ Computers
Colm Kelleher, Frédéric Holweck
We present definitive violations of non-contextual hidden variable bounds in the latest generation of IBM noisy intermediate-scale quantum computers (NISQ). These violations are ba…
A Relationship Between Nonphysical Quasi-probabilities and Nonlocality Objectivity
Colm Kelleher
Density matrices are the most general descriptions of quantum states, covering both pure and mixed states. Positive semidefiniteness is a physical requirement of density matrices,…