Magnetostrictively Induced Stationary Entanglement between Two Microwave Fields

Physical Review Letters
Mei YuJie Li

Abstract

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.

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Citations

Oct 30, 2020·Optics Express·Zhi-Bo YangRong-Can Yang
Sep 4, 2021·Physical Review Letters·Feng-Xiao SunKe Xia

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