物理学院学术报告（第6期）

报告题目：A thermal-noise-resilient microwave quantum network traversing 4 K

报告专家：钟有鹏 研究员 深圳国际量子研究院

报告时间：2025年3月14日（周五）14: 30

报告地点：理6栋302      邀请人：李赛

报告内容：

Quantum communication at microwave frequencies has been fundamentally constrained by the susceptibility of microwave photons to thermal noise, hindering their application in scalable quantum networks. Here we demonstrate a thermal-noise-resilient microwave quantum network that establishes coherent coupling between two superconducting qubits through a 4 K thermalized niobium titanium transmission line. By overcoupling the communication channel to a cold load at 10 mK, we suppress the effective thermal occupancy of the channel to 0.06 photons through radiative cooling – a two-order-of-magnitude reduction below ambient thermal noise. We then decouple the cold load and rapidly transfer microwave quantum states through the channel while it rethermalizes, achieving a 58.5% state transfer fidelity and a 52.3% Bell entanglement fidelity, both exceeding the classical communication threshold. Our architecture overcomes the temperature-compatibility barrier for microwave quantum systems, providing a scalable framework for distributed quantum computing and enabling hybrid quantum networks with higher-temperature semiconductor or photonic platforms.

专家简介：

钟有鹏，深圳国际量子研究院研究员，入选国家青年人才项目。2013年本科毕业于浙江大学，2019年博士毕业于芝加哥大学，随后在芝加哥大学继续一年多的博士后研究。2020年-2025年在南方科技大学工作，2025年1月加入深圳国际量子研究院。主要从事超导量子计算实验研究，发表SCI 论文30 余篇，包括以第一/通信作者在Nature, Nature Electronics, Nature Physics, Nature Communications, PRL等国际期刊发表论文，代表性成果包括多比特最大纠缠态（GHZ态）的跨芯片传输，超低损耗量子芯片互联等。