Leggett-Garg inequality violations yield lower bounds on quantum Fisher information in stationary pure and thermal states, serving as a witness for many-body quantum coherence.
To do so, we couple the system sequentially to two independent pointers( X1,P 1)and( X2,P 2), both prepared in identical minimum-uncertainty states|ψ0⟩as in(S13)
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Leggett-Garg Inequality Violations Bound Quantum Fisher Information
Leggett-Garg inequality violations yield lower bounds on quantum Fisher information in stationary pure and thermal states, serving as a witness for many-body quantum coherence.