Two quantum states ρ₁ and ρ₂ commute exactly when tr(ρ₁²ρ₂²) = tr(ρ₁ ρ₂ ρ₁ ρ₂).
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quant-ph 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
A two-copy comparison game yields an operational discriminability score that bounds CHSH values through noncontextual models and conditional state distinguishability.
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Commutativity from a single Bargmann invariant equality
Two quantum states ρ₁ and ρ₂ commute exactly when tr(ρ₁²ρ₂²) = tr(ρ₁ ρ₂ ρ₁ ρ₂).
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Operational Discriminability: From Noncontextuality Bounds to Bell Correlations
A two-copy comparison game yields an operational discriminability score that bounds CHSH values through noncontextual models and conditional state distinguishability.