Magnon Blockade with Skyrmion Qubit-Magnon Coupling in a Hybrid Quantum System

TL;DR

This paper proposes a theoretical scheme to generate magnon blockade in a hybrid system of a YIG micromagnet and skyrmion, enabling high-purity single-magnon states for quantum information processing.

Contribution

It introduces a novel all-magnetic platform combining skyrmions and magnons to achieve and analyze magnon blockade, including optimal conditions and underlying mechanisms.

Findings

Magnon blockade can be enhanced with appropriate driving and probing fields.

The scheme effectively suppresses multi-magnon states, producing high-purity single-magnon states.

Both conventional and unconventional magnon blockade mechanisms are identified.

Abstract

Magnon blockade is a fundamental quantum phenomenon for generating single-magnon state, which gradually becomes one of the candidates for quantum information processing. In this paper, we propose a theoretical scheme to generate the magnon blockade in a hybrid system consisting of a YIG micromagnet and a skyrmion. Considering weak probing of the magnon and driving of the skyrmion qubit, the second-order correlation function is analytically derived, and the optimal condition for realizing the magnon blockade is identified. Under the optimal condition, we systematically analyze the behavior of the second-order correlation function $g^{(2)}(0)$ under different parameter regimes. Our analysis shows that with appropriate driving and probing field intensities, the magnon blockade effect can be significantly enhanced, effectively suppressing multi-magnon states and facilitating the generation of high-purity single-magnon states exhibiting pronounced antibunching. Furthermore, we explore the physical mechanisms underlying the magnon blockade, revealing the coexistence and interplay of conventional and unconventional magnon blockade. This scheme provides a versatile all-magnetic platform for generating high purity single-magnon sources.