Hardware-Efficient Bosonic Module for Entangling Superconducting Quantum Processors via Optical Networks

• URL: http://arxiv.org/abs/2511.10407v1
• Date: Fri, 14 Nov 2025 01:49:34 GMT
• Title: Hardware-Efficient Bosonic Module for Entangling Superconducting Quantum Processors via Optical Networks
• Authors: Jia-Hua Zou, Weizhou Cai, Jia-Qi Wang, Zheng-Xu Zhu, Qing-Xuan Jie, Xin-Biao Xu, Weiting Wang, Guang-Can Guo, Luyan Sun, Chang-Ling Zou,
• Abstract summary: Microwave-to-optical (M2O) transducers pose challenges due to frequency mismatches and qubit decoherence.<n>We propose a modular architecture using SNAIL-based parametric coupling to interface Brillouin M2O transducers with long-lived 3D cavities.<n>Our cavity-based approach outperforms transmon schemes, providing a practical pathway for distributed superconducting quantum computing.
• Score: 5.181101976838568
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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