Efficient Quantum Transduction using Magnetic Topological Insulators

Transduction of quantum information between distinct quantum systems is an essential step in various applications, including quantum networks and quantum computing. Efficient quantum transduction necessitates transducers that can strongly interact with photons with vastly different frequencies. In this work, we propose that solid-state magnetic topological insulators can potentially serve as highly effective transducers, thanks to their topologically enhanced optical responses, robust spin-orbit coupling, as well as substantial spin density. Using MnBi₂Te₄ as an example, we showcase that unit transduction fidelity can be achieved with modest experimental requirements, while the transduction bandwidth can reach the GHz range.