Superconducting qubits are among the most promising platforms for realizing fault-tolerant, large-scale quantum computers. Despite rapid progress, challenges remain in extending coherence times and improving connectivity. Hybrid quantum systems that couple superconducting circuits to mechanical resonators provide a promising route to scalability. Notably, silicon nanomechanical resonators offer ultra-long lifetimes, and superconducting circuits interfaced with optomechanical cavities can enable microwave-to-optics quantum transduction. However, existing approaches that rely on heterogeneously integrated piezoelectric thin films often degrade resonator lifetimes and reduce transduction efficiency. In this project, we propose a quantum electromechanical transduction mechanism for superconducting circuits on silicon mediated by single boron acceptors, thereby eliminating the need for piezoelectric integration. Using a microscopic model of boron acceptors, we calculate the relevant coupling parameters in low-mode-volume electrical and acoustic devices, and investigate optimal control protocols for high-efficiency quantum state storage. This approach may grant superconducting circuits access to long-lived silicon nanomechanical resonators as quantum memories and enable efficient electro-opto-mechanical transduction.
Project is currently funded by: Federal