Magnon bundle in a strongly dissipative magnet

TL;DR

This paper proposes a method to generate magnon bundles in a hybrid magnet-qubit system, demonstrating that magnetic dissipation can enable multi-magnon generation even in strongly dissipative materials, expanding quantum spintronics possibilities.

Contribution

It introduces a novel approach to generate magnon bundles using super-Rabi oscillations in a dissipative magnetic system, challenging the reliance on low-damping insulators.

Findings

Magnon bundles can be generated via super-Rabi oscillations in dissipative systems.

Magnetic dissipation, up to 0.1, can enable magnon bundle formation.

The approach broadens the range of magnetic materials usable in quantum spintronics.

Abstract

Hybrid quantum systems based on magnetic platforms have witnessed the birth and fast development of quantum spintronics. Until now, most of the studies rely on magnetic excitations in low-damping magnetic insulators, particularly yttrium iron garnet, while a large class of magnetic systems is ruled out in this interdisciplinary field. Here we propose the generation of a magnon bundle in a hybrid magnet-qubit system, where two or more magnons are emitted simultaneously. By tuning the driving frequency of qubit to match the detuning between magnon and qubit mode, one can effectively generate a magnon bundle via super-Rabi oscillations. In contrast with general wisdom, magnetic dissipation plays an enabling role in generating the magnon bundle, where the relaxation time of magnons determines the typical time delay between two successive magnons. The maximal damping that allows an antibunched magnon bundle can reach the order of 0.1, which may break the monopoly of low-dissipation magnetic insulators in quantum spintronics and enables a large class of magnetic materials for quantum manipulation. Further, our finding may provide a scalable and generic platform to study multi-magnon physics and benefit the design of magnonic networks for quantum information processing.