For stochastic AC fields, the quantum Fisher information for estimating the frequency separation of two close signals is approximately 2/ωr², and the bound is approachable with Dicke-state superpositions.
Robust asymptotic entanglement under mul- tipartite collective dephasing
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Quantum-Optimal Frequency Estimation of Stochastic AC Fields
For stochastic AC fields, the quantum Fisher information for estimating the frequency separation of two close signals is approximately 2/ωr², and the bound is approachable with Dicke-state superpositions.