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Bell-CHSH inequality and unitary operators

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arxiv 2403.15276 v3 pith:WQ2PNQOV submitted 2024-03-22 quant-ph hep-th

classification quant-phhep-th
keywords operatorsunitaryquantumbell-chshboundsclassicalfieldinequality
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abstract

Unitary operators are employed to investigate the violation of the Bell-CHSH inequality. The ensuing modifications affecting both classical and quantum bounds are elucidated. The relevance of a particular class of unitary operators whose expectation values are real is pointed out. For these operators, the classical and quantum bounds remain unaltered, being given, respectively, by $2$ and $2\sqrt{2}$. As an example, the Weyl unitary operators for a real scalar field in relativistic Quantum Field Theory are discussed.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Entangled Schr\"odinger cat states, vacuum projector and Bell-CHSH inequality

    quant-ph 2025-01 reject novelty 4.0 of 10

    A proposed vacuum-projector-based Bell test for Schrödinger cat states claims large Bell-CHSH violations, but the chosen equal measurement settings reduce the test to a single correlation bounded by 2.

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