$\mathcal{PT}$-symmetry-breaking enhanced cavity optomechanical magnetometry

• URL: http://arxiv.org/abs/2002.10207v2
• Date: Tue, 17 Mar 2020 08:38:03 GMT
• Title: $\mathcal{PT}$-symmetry-breaking enhanced cavity optomechanical magnetometry
• Authors: Zhucheng Zhang, Yi-Ping Wang, and Xiaoguang Wang
• Abstract summary: The sensitivity of magnetic field sensing can be increased from $10-9$T to $10-11$T. An ultrahigh-sensitivity magnetometer can be achieved in the $mathcalPT$-symmetry-breaking COMS.
• Score: 0.333178250753689
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: $\mathcal{PT}$-symmetry-breaking enhanced cavity optomechanical magnetometer is proposed, which is achieved by monitoring the change of intensity of a nonlinear four-wave mixing (FWM) process in a gain-cavity-assisted cavity optomechanical system (COMS). Compared with the traditional single loss COMS, the FWM intensity can be enhanced by two orders of magnitude when the gain-cavity-assisted COMS operates at the $\mathcal{PT}$-symmetry-breaking phase. Meanwhile, the sensitivity of magnetic field sensing can be increased from $10^{-9}$T to $10^{-11}$T. This originally comes from the fact that the effective detuning and decay of loss-cavity can be effectively modified in the $\mathcal{PT}$-symmetry-breaking phase. Our work shows that an ultrahigh-sensitivity magnetometer can be achieved in the $\mathcal{PT}$-symmetry-breaking COMS, which will have wide applications in the field of quantum sensing.

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