Event Details

Recent years have witnessed a significant progress of realizing strong light-matter interaction using collective excitations of spin ensembles in ferrimagnetic systems, for example in yttrium iron garnet (YIG), thanks to their very high spin density and low damping rate. It is found that the Kittel (uniformly precessing) mode in the YIG sphere can realize strong coupling with the microwave photons in a high-quality cavity, leading to cavity polaritons [1-5] and the vacuum Rabi splitting. Clearly, magnon systems provide us with a new platform for studying unique effects of strong-coupling QED. By coupling the magnons to a superconducting qubit [6] or phonons (vibrational modes of the YIG sphere) [7], the cavity-magnon systems are extended to hybrid systems, which allow one to resolve magnon number states [8], or generate tripartite entangled states of magnons, photons, and phonons [9]. In this talk, I will present our recent work on the generation of tripartite entangled states [9], as well as squeezed states of magnons and phonons [10] in a hybrid magnon-photon-phonon system. Basic knowledge of magnon systems and optomechanical systems will be introduced, which are helpful for the present study of magnomechanical systems.

References

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