Magnetostrictively Induced Stationary Entanglement between Two Microwave Fields

Journal article (2020)

Authors

Mei Yu Zhejiang University
Heng Tao Shen University of Oxford, Shanxi University
J. Li Kavli institute of nanoscience Delft, Zhejiang University, QN/Groeblacher Lab - AS
Research Group
QN/Groeblacher Lab (AS) (TU Delft)
Copyright: © 2020 Mei Yu, Heng Shen, J. Li
DOI: https://doi.org/10.1103/PhysRevLett.124.213604
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Published Date

2020

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Groeblacher Lab

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.