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Various schemes have been proposed to overcome the drawback of thedecoherence on quantum-enhanced parameter estimation. Here we suggest analternative method, quantum feedback, to enhance the parameter precision ofoptimal quantum estimation of a dissipative qubit by investigating its dynamicsof quantum Fisher information. We find that compared with the case withoutfeedback, the quantum Fisher information of the dissipative qubit in the caseof feedback has a large maximum value in time evolution and a smaller decayrate in the long time.

Enhancing parameter precision of optimal quantum estimation by direct quantum feedback