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.
Bell's and Mermin's inequalities, entangled coherent states and unitary operators
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abstract
We elaborate on the recent proposal of employing unitary operators in Quantum Mechanics. The Bell and Mermin inequalities for entangled coherent states are scrutinized by making use of the unitary displacement operators. A violation of the Mermin inequality close to the maximum allowed value is reported, in agreement with the existing literature.
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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.