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.
Express 27, 31864-31873 (2019)
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Entangled Schr\"odinger cat states, vacuum projector and Bell-CHSH inequality
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.