Hybrid Architecture for Engineering Magnonic Quantum Networks

TL;DR

This paper proposes a theoretical hybrid system of superconducting loops and magnetic particles to create tunable magnonic crystals, enabling long-distance quantum communication and control of spin qubits.

Contribution

It introduces a novel hybrid architecture combining superconducting loops and magnetic particles for engineered magnonic band structures and quantum information transfer.

Findings

Magnonic band structures can be tuned via network arrangements.

Magnons can act as quantum buses for spin qubits.

The system enables long-distance magnetic coupling of qubits.

Abstract

We show theoretically that a network of superconducting loops and magnetic particles can be used to implement magnonic crystals with tunable magnonic band structures. In our approach, the loops mediate interactions between the particles and allow magnetic excitations to tunnel over long distances. As a result, different arrangements of loops and particles allow one to engineer the band structure for the magnonic excitations. Furthermore, we show how magnons in such crystals can serve as a quantum bus for long-distance magnetic coupling of spin qubits. The qubits are coupled to the magnets in the network by their local magnetic-dipole interaction and provide an integrated way to measure the state of the magnonic quantum network.