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Mei Yu

Mei Yu Phd student

Room: B-003



See also arxiv

Mei Yu, Shi-Yao Zhu and Jie Li
Macroscopic entanglement of two magnon modes via quantum correlated microwave fields
J. Phys. B 53, 065402 (2020), arXiv:1906.09921

We present a scheme to entangle two magnon modes in two macroscopic yttrium-iron-garnet spheres. The two spheres are placed inside two microwave cavities, which are driven by a two-mode squeezed microwave field. By using the linear state-swap interaction between the cavity and the magnon mode in each cavity, the quantum correlation of the two driving fields is with high efficiency transferred to the two magnon modes. Considerable entanglement could be achieved under experimentally achievable conditions $g\gg {\kappa }_{a}\gg {\kappa }_{m}$, where g is the cavity-magnon coupling rate and κa, κm are the decay rates of the cavity and magnon modes, respectively. The entanglement is in the steady state and robust against temperature, surviving up to hundreds of milliKelvin with experimentally accessible two-mode squeezed source.

Mei Yu, Heng Shen, and Jie Li
Magnetostrictively Induced Stationary Entanglement between Two Microwave Fields
Phys. Rev. Lett. 124, 213604 (2020), arXiv:1909.05936

We present a scheme to entangle two microwave fields by using the nonlinear magnetostrictive interaction in a ferrimagnet. The magnetostrictive interaction enables the coupling between a magnon mode (spin wave) and a mechanical mode in the ferrimagnet, and the magnon mode simultaneously couples to two microwave cavity fields via the magnetic dipole interaction. The magnon-phonon coupling is enhanced by directly driving the ferrimagnet with a strong red-detuned microwave field, and the driving photons are scattered onto two sidebands induced by the mechanical motion. We show that two cavity fields can be prepared in a stationary entangled state if they are, respectively, resonant with two mechanical sidebands. The present scheme illustrates a new mechanism for creating entangled states of optical fields and enables potential applications in quantum information science and quantum tasks that require entangled microwave fields.