Tunable strong coupling between a transmon and a magnon

Feng-Yang Zhang; Shi-Wen He; Tong Liu; Qi-Cheng Wu; Chui-Ping Yang

doi:10.1103/PhysRevA.109.022442

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Tunable strong coupling between a transmon and a magnon

Feng-Yang Zhang, Shi-Wen He, Tong Liu, Qi-Cheng Wu, Chui-Ping Yang

DOI 10.1103/PhysRevA.109.022442 · Physical Review A

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Abstract

Coherent coupling between a ferromagnetic magnon and a superconducting qubit demonstrates a special fascination in the quantum information field. Here, we construct a hybrid system to realize tunable strong coupling between a transmon and a magnon. In a hybrid system, the transmon couples to a cavity while the magnon couples to the other cavity. Meanwhile, the two cavities are coupled via a hopping interaction. In addition, we demonstrate some applications of this system to quantum information. Specifically, a high-fidelity iswap† gate and a maximally entangled state between the transmon and the magnon with this coupling system can be realized even if the dissipation is considered. Moreover, by employing more cavities and magnons, the W-type entangled state can be created with multiple transmons. This hybrid system provides an alternative platform for scalable quantum information processing.