Dephasing noise can increase the quantum Fisher information for time and global-field estimation, yielding noise-enhanced quantum clocks and sensors in specific regimes.
That is, t can be estimated with an error var(ˆtopt) ≤ 1/ ( ‖[H,ρ t]‖2 2 +γ2 t ‖[L, [L,ρ t]]‖2 2 )
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Noise-enhanced quantum clocks and global field sensors
Dephasing noise can increase the quantum Fisher information for time and global-field estimation, yielding noise-enhanced quantum clocks and sensors in specific regimes.