Quantum parametric amplifiation of phonon-mediated magnon-spin interaction

TL;DR

This paper demonstrates how quantum parametric amplification can enhance magnon-phonon coupling in a hybrid system, enabling strong quantum state transfer and advancing quantum information processing with mechanical and spin systems.

Contribution

It introduces a method to achieve strong and ultrastrong magnon-phonon coupling via mechanical parametric amplification, facilitating coherent quantum state transfer in hybrid magnonic systems.

Findings

Strong magnon-phonon coupling achieved with feasible parameters.

Mechanical parametric drive enables transition into ultrastrong coupling regime.

Coherent state transfer between nanomagnet and NV center demonstrated.

Abstract

The recently developed hybrid magnonics provides new opportunities for advances in both the study of magnetism and the development of quantum information processing. However, engineering coherent quantum state transfer between magnons and specific information carriers, in particular, mechanical oscillators and solid-state spins, remains challenging due to the intrinsically weak interactions and the frequency mismatch between diffrent components. Here, we show how to strongly couple the magnon modes in a nanomagnet to the quantized mechanical motion (phonons) of a micromechanical cantilever in a hybrid tripartite system. The coherent and enhanced magnon-phonon coupling is engineered by introducing the quantum parametric amplifiation of the mechanical motion. With experimentally feasible parameters, we show that the mechanical parametric drive can be adjusted to drive the system into the strong-coupling regime and even the ultrastrong-coupling regime. Furthermore, we show the coherent state transfer between the nanomagnet and a nitrogen-vacancy center in the dispersive-coupling regime, with the magnon-spin interaction mediated by the virtually-excited squeezed phonons. The amplifid mechanical noise can hardly interrupt the coherent dynamics of the system even for low mechanical quality factors, which removes the requirement of applying additional engineered-reservoir techniques. Our work opens up prospects for developing novel quantum transducers, quantum memories and high-precision measurements.