Chiral coupling between a ferromagnetic magnon and a superconducting qubit

TL;DR

This paper proposes a method to achieve directional, chiral coupling between a ferromagnetic magnon and a superconducting qubit using a coupled-cavity array, enabling advanced quantum magnonic devices.

Contribution

It introduces a novel scheme for chiral qubit-magnon interaction mediated by a tunable phase in a coupled-cavity array, advancing quantum magnonic network design.

Findings

Achieved directional qubit-magnon interaction via quantum interference.

Demonstrated tunable phase control for chiral coupling.

Proposed a new platform for quantum magnonic devices.

Abstract

Chiral coupling at the single-quantum level promises to be a remarkable potential for quantum information processing. Here we propose to achieve a chiral interaction between a magnon mode in a ferromagnetic sphere and a superconducting qubit mediated by a one-dimensional coupled-cavity array. When the qubit is coupled to two lattice sites of the array and each one is encoded with a tunable phase, we can acquire a directional qubit-magnon interaction via the quantum interference effect. This work opens up a new route to construct chiral devices, which are expected to become a building block in quantum magnonic networks.