Generation of microwave-optics entanglement via reservoir engineering in cavity magnonic systems

The strong microwave-optics entanglement is generated based on a cavity magnonic hybrid quantum system, where the magnon mode couples to the microwave cavity mode via magnetic dipole interaction and interacts with the optical modes via magneto-optical effects. It is shown that the microwave-optics entanglement can be achieved by the intermediate magnon mode acting as an engineered reservoir to cool the Bogoliubov mode, which consists of an optical mode and a microwave cavity mode. By optimizing the ratio of effective couplings and the dissipation of the magnon mode, the strong microwave-optics entanglement is obtained, which is far larger than that based on the coherent parametric coupling. The microwave-optics entanglement created in our model is that between microwave mode and polarized optical mode. Such entanglement which involves the degrees of freedom of polarization may have potential applications in polarization-dependent quantum information tasks.