Magnons for quantum information

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We followed through and completed several collaborations with experimental groups, on magnon nonlinearity and its applications in emerging technologies such as quantum information. In collaboration with Toeno van der Sar group at TU Delft, we investigated interaction of spin waves in a heterostructure of a YIG thin film and a diamond hosting a collection of NV center spins. We showed that the magnon nonlinearity can be used for wideband magnetometry and a coherent control of NV center spins. This work was published in Nat. Commun. 14, 490 (2023).In a collaboration with Haiming Yu group in Beijing, we thoroughly investigated the interactions between magnons in a heterostructure of a nanowire and a thin film, and demonstrated an interlayer three magnon interaction, which can be used for generation of non-local correlations useful in quantum information applications. This work was published in Phys. Rev. Lett. 130, 046701 (2023). In collaboration with Eiji Saitoh group at Univ. of Tokyo, we showed that three magnon scattering in an YIG magnetic element can be used for persistent coherence of ferromagnetic resonance. This work is currently under review. In another work published as Phys. Rev. Lett. 130, 046703 (2023), in collaboration with Hidekazu Kurebayashi group at UCL (London), we showed that three magnon scattering can be used for controlling magnon polaritons.