Quantum-Enhanced Metrology in Cavity Magnomechanics

Magnons, as fundamental quasiparticles emerged in elementary spin excitations, hold a big promise for innovating quantum technologies in information coding and processing. Here we discover subtle roles of entanglement in a metrological scheme based on an experimentally feasible cavity magnomechanical system, where the magnons are responsible for sensing a weak magnetic field whereas the cavity field carries out a precision measurement of the weak field. By establishing exact relations between the Fisher information and entanglement, we show that for the weak coupling case the measurement precision can reach the Heisenberg limit, whereas quantum criticality enables us to enhance measurement precision for the strong coupling case. In particular, we also find that the entanglement between magnons and photons is of crucial importance during the dynamical encoding process, but the presence of such an entanglement in the measurement process dramatically reduces the final measurement precision.

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