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AMO/QO SEMINAR SERIES


"Preparing Quantum States in Cavity Magnomechanics"


Dr. Jie Li
TAMU, Zhejiang University

ABSTRACT 

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.
[1] H. Huebl, et al., Phys. Rev. Lett. 111, 127003 (2013). [2] Y. Tabuchi et al., Phys. Rev. Lett. 113, 083603 (2014). [3] X. Zhang et al., Phys. Rev. Lett. 113, 156401 (2014). [4] M. Goryachev et al., Phys. Rev. Applied 2, 054002 (2014). [5] L. Bai et al., Phys. Rev. Lett. 114, 227201 (2015). [6] Y. Tabuchi et al., Science 349, 405 (2015). [7] X. Zhang, C. L. Zou, L. Jiang, and H. X. Tang, Sci. Adv. 2, e1501286 (2016). [8] D. Lachance-Quirion et al., Sci. Adv. 3, e1603150 (2017). [9] J. Li, S. Y. Zhu, and G. S. Agarwal, Phys. Rev. Lett. 121, 203601 (2018). [10] J. Li, S. Y. Zhu, and G. S. Agarwal, In preparation (2018).



Tuesday, December 4, 2018
IQSE Seminar Room, 12:00 Noon
(578 MPHY)


Institute for Quantum Science and Engineering
Texas A&M University

Pizza, salad, and soda to be served at 11:30 a.m.

Host: Dr. Girish Agarwal