Scaling superconducting quantum processors beyond single dilution refrigerators requires efficient optical interconnects, yet integrating microwave-to-optical (M2O) transducers poses challenges due to frequency mismatches and qubit decoherence. We propose a modular architecture using SNAIL-based parametric coupling to interface Brillouin M2O transducers with long-lived 3D cavities, while maintaining plug-and-play compatibility. Through numerical simulations incorporating realistic noises, including laser heating, propagation losses, and detection inefficiency, we demonstrate raw entangled bit fidelities of F~0.8 at kHz-level rates over 30 km using the Duan-Lukin-Cirac-Zoller (DLCZ) protocol. Implementing asymmetric entanglement pumping tailored to amplitude damping errors, we achieve purified fidelities F~0.94 at 0.2 kHz rates. Our cavity-based approach outperforms transmon schemes, providing a practical pathway for distributed superconducting quantum computing.
@article{arxiv.2511.10407,
title = {Hardware-Efficient Bosonic Module for Entangling Superconducting Quantum Processors via Optical Networks},
author = {Jia-Hua Zou and Weizhou Cai and Jia-Qi Wang and Zheng-Xu Zhu and Qing-Xuan Jie and Xin-Biao Xu and Weiting Wang and Guang-Can Guo and Luyan Sun and Chang-Ling Zou},
journal= {arXiv preprint arXiv:2511.10407},
year = {2025}
}