Efficient Quantum Transduction Using Anti-Ferromagnetic Topological Insulators

TL;DR

This paper proposes using anti-ferromagnetic topological insulators, like MnBi2Te4, as highly efficient quantum transducers with over 90% efficiency and GHz bandwidth, leveraging their unique optical and magnetic properties.

Contribution

It introduces a novel approach to quantum transduction using magnetic topological insulators, highlighting their enhanced nonlinear interactions and potential for high efficiency.

Findings

Quantum transduction efficiency can exceed 90%.

Transduction bandwidth can reach the GHz range.

Magnetic topological insulators enable strong nonlinear optical interactions.

Abstract

Transduction of quantum information between distinct quantum systems is an essential step in various applications, including quantum communications and quantum computing. However, mediating photons of vastly different frequencies and designing high-performance transducers are highly nontrivial, due to multifaceted and sometimes conflicting requirements. In this work, we first discuss some general principles for quantum transducer design, and then propose solid-state anti-ferromagnetic topological insulators to serve as particularly effective transducers. First, the anti-ferromagnetic order can minimize detrimental influences on nearby quantum systems caused by magnetic interactions. Second, topological insulators exhibit band-inversion, which can greatly enhance their optical responses. This property, coupled with robust spin-orbit coupling and high spin density, results in strong nonlinear interaction in magnetic topological insulators, thereby substantially improving transduction efficiency. Using MnBi2Te4 as an example, we discuss the potential experimental realization of quantum transduction based on magnetic topological materials. Particularly, we showcase that quantum transduction efficiency exceeding 90% can be achieved with modest experimental requirements, while the transduction bandwidth can reach the GHz range. The strong nonlinear photonic interactions in magnetic topological insulators can find diverse applications besides quantum transduction, such as quantum squeezing.