In star-shaped quantum networks, local filters applied before measurement can reveal hidden non n-locality, and a non-separable central filter can do so even when separable filters cannot.
A closed-form necessary and sufficient condition for any two-qubit state to show hidden nonlocality w.r.t the Bell-CHSH inequality
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In this note, we discuss a closed-form necessary and sufficient condition for any two-qubit state to show hidden nonlocality w.r.t the Bell-CHSH inequality. This is then used to numerically compute the relative volume of states showing hidden Bell-CHSH non-locality , among all two-qubit states with one-sided reduction maximally mixed.
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Revealing Hidden Non n-Locality In n-Local Star Network
In star-shaped quantum networks, local filters applied before measurement can reveal hidden non n-locality, and a non-separable central filter can do so even when separable filters cannot.