Magnon Blockade in a Hybrid Ferromagnet-Superconductor Quantum System

TL;DR

This paper theoretically demonstrates the feasibility of using a hybrid ferromagnet-superconductor system to generate single magnons via blockade effects, advancing quantum magnonics and potential quantum technologies.

Contribution

It introduces a theoretical model showing how magnon blockade can be achieved in a hybrid system, highlighting conditions for single magnon source development.

Findings

Magnon blockade depends on qubit-magnon coupling and detuning.

Signatures of magnon blockade require cryogenic temperatures.

The study provides insights into quantum magnon phenomena.

Abstract

The implementation of a single magnon level quantum manipulation is one of the fundamental targets in quantum magnetism with a significant practical relevance for precision metrology, quantum information processing, and quantum simulation. Here, we demonstrate theoretically the feasibility of using a hybrid ferromagnet-superconductor quantum system to prepare a single magnon source based on magnon blockade effects. By numerically solving the quantum master equation, we show that the second-order correlation function of the magnon mode depends crucially on the relation between the qubit-magnon coupling strength and the driving detuning, and simultaneously signatures of the magnon blockade appear only under quite stringent conditions of a cryogenic temperature. In addition to providing perception into the quantum phenomena of magnon, the study of magnon blockade effects will help to develop novel technologies for exploring the undiscovered magnon traits at the quantum level and may find applications in designing single magnon emitters.