Chinese researchers hit 98% efficiency in a superconducting quantum router

[HollywoodHogan]

Chinese research teams reported a breakthrough in quantum random access memory hardware, achieving up to 98 percent information transmission efficiency for a single quantum router built on the domestically developed Origin Wukong superconducting quantum computer. The work, reported by Science and Technology Daily, developed a coherent quantum routing system for bucket brigade QRAM, which functions like a fast lane for moving data efficiently, addressing a key challenge in scaling this kind of quantum memory

Researchers built three independent quantum routers along with a two layer quantum routing network for testing on Origin Wukong, China's third generation independently developed superconducting quantum computer. The single router achieved that 98 percent transmission efficiency, while the full two layer network reached 93 percent overall efficiency. In random access tests specifically, average fidelity reached 94.8 percent for the single router and 82.4 percent for the two layer network

The teams say the breakthrough offers a new way to build scalable QRAM on existing superconducting hardware rather than requiring an entirely new hardware approach, and reflects a broader shift in China's quantum research from improving individual performance metrics toward testing more complex integrated quantum functions on real machines. Curious what people think this specific milestone means for the broader race to build genuinely useful QRAM, a component many quantum algorithms for machine learning and search assume exists but that remains a serious unsolved engineering challenge

China achieves 98% transmission efficiency in single quantum router breakthrough - Global Timeswww.globaltimes.cn

[Solid Gary]

Building this on existing superconducting hardware rather than requiring an entirely new architecture is a genuinely practical choice, leveraging infrastructure that's already being invested in heavily rather than starting from scratch