Optomechanically Induced Faraday Effect with Mechanical Driving and Coulomb Coupling

We investigate the enhancement of entanglement and EPR steering in a parity-time(PT-) symmetric-like cavity-opto-magnomechanical system. The system consists of an optical cavity, a magnon mode in a ferromagnetic crystal, a phonon mode, and a microwave cavity. Our findings demonstrate that microwave-cavity gain significantly boosts distant quantum entanglement and greatly improves the robustness of bipartite entanglement against environment temperature. Additionally, we observe an enhancement of tripartite entanglement within the system and uncover the phenomenon of entanglement transfer. Notably, we also achieve one-way steering and two-way asymmetric steering in the system. This study offers insights into the integration of traditional optomechanics and cavity magnomechanics, presenting a novel approach to manipulate asymmetric quantum steering between two distant macroscopic objects. The implications of our research extend to the fields of quantum state preparation and quantum information.

Entanglement enhancement and EPR steering based on a PT-symmetric-like cavity-opto-magnomechanical hybrid system

Luo,

Cong,

Zheng

et al. 2023

Parametrically amplified nonreciprocal magnon laser in a hybrid cavity optomagnonical system

He,

Wang,

Han

et al. 2023

We propose a scheme to achieve a tunable nonreciprocal magnon laser with parametric amplification in a hybrid cavity optomagnonical system, which consists a yttrium iron garnet (YIG) sphere and a spinning resonator. We demonstrate the control of magnon laser can be enhanced via parametric amplification, which make easier and more convenient to control the magnon laser. Moreover, we analyze and evaluate the effects of pump light input direction and amplification amplitude on the magnon gain and laser threshold power. The results indicate that we can obtian a higher magnon gain and a broader range of threshold power of the magnon laser. In our scheme both the nonreciprocity and magnon gain of the magnon laser can be increased significantly. Our proposal provides a way to obtain a novel nonreciprocal magnon laser and offers new possibilities for both nonreciprocal optics and spin-electronics applications.

Enhanced force sensitivity based on Duffing nonlinearity in a dissipatively coupled optomechanical system

Zhu,

Han,

Wang

et al. 2024

The study of force sensitivity based on a cavity optomechanical system plays a prominent role in quantum precision measurement and provides an ideal platform for precision sensing technology. Here, we propose a scheme to enhance the force sensitivity of a dissipatively coupled optomechanical system by inducing Duffing nonlinearity. The numerical analysis shows that inducing Duffing nonlinearity significantly improves the force sensitivity compared to the system without Duffing nonlinearity, even surpassing the standard quantum limit (SQL) by more than five orders of magnitude. Moreover, we demonstrated that the sensitivity of force sensing is robust to temperature when Duffing nonlinearity is induced. More interestingly, the induction of Duffing nonlinearity broadens the detection bandwidth. At the same time, the detection frequency below the SQL also experiences a significant frequency shift with changes in the nonlinear amplitude. Our scheme not only holds potential for applications in quantum manipulation but also realizes macroscopic quantum effects.