For a squeezed bosonic sensor, fixed winding number n caps QFI at T^{4n+6}, while letting n grow with time attains the optimal exponential law F ~ e^{ΓωT} with Γ≈0.9745 via phase-dependent on-off control.
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Fundamental Scaling Limit in Critical Quantum Metrology
For a squeezed bosonic sensor, fixed winding number n caps QFI at T^{4n+6}, while letting n grow with time attains the optimal exponential law F ~ e^{ΓωT} with Γ≈0.9745 via phase-dependent on-off control.