Quadratic quantum metrology under collective dephasing reaches N^(-5/4) precision with product states and N^(-3/2) with spin-squeezed states plus nonlinear readout in the Zeno regime, claimed optimal.
(B13) This coincides with Eq
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Optimal asymptotic precision bounds for nonlinear quantum metrology under collective dephasing
Quadratic quantum metrology under collective dephasing reaches N^(-5/4) precision with product states and N^(-3/2) with spin-squeezed states plus nonlinear readout in the Zeno regime, claimed optimal.