Wideband Coherent Microwave Conversion via Magnon Nonlinearity in Hybrid Quantum System

TL;DR

This paper demonstrates a novel microwave frequency conversion method in a hybrid quantum system using nonlinear magnetic responses in spintronic devices, achieving broad bandwidth and applications in quantum control.

Contribution

It introduces a new approach for microwave frequency conversion utilizing magnetic nonlinearity in a hybrid quantum system, expanding the potential of spintronic devices in quantum technologies.

Findings

Achieved a conversion bandwidth from 0.1 to 12 GHz.

Demonstrated up to 25th order frequency conversion.

Showcased applications in frequency detection and qubit control.

Abstract

Frequency conversion is a widely realized physical process in nonlinear systems of optics and electronics. As an emerging nonlinear platform, spintronic devices have the potential to achieve stronger frequency conversion. Here, we demonstrated a microwave frequency conversion method in a hybrid quantum system, integrating nitrogen-vacancy centers in diamond with magnetic thin film CoFeB. We achieve a conversion bandwidth ranging from 0.1 to 12GHz, presenting an up to $\mathrm{25^{th}}$ order frequency conversion and further display the application of this method for frequency detection and qubits coherent control. Distinct from traditional frequency conversion techniques based on nonlinear electric response, our approach employs nonlinear magnetic response in spintronic devices. The nonlinearity, originating from the symmetry breaking such as domain walls in magnetic films, presents that our method can be adapted to hybrid systems of other spintronic devices and spin qubits, expanding the application scope of spintronic devices and providing a promising on-chip platform for coupling quantum systems.