China achieves 98% transmission efficiency in single quantum router breakthrough

Origin Wukong superconducting quantum computer cluster Photo: Courtesy of the Anhui Quantum Computing Engineering Research Center

Chinese research teams have achieved a breakthrough on an independently developed superconducting quantum computer, with tests showing information transmission efficiency of up to 98 percent for a single quantum router, Science and Technology Daily reported on Wednesday.

The achievement was jointly made by several Chinese research teams.

The teams developed a coherent quantum routing system for bucket-brigade quantum random access memory (QRAM) on the Origin Wukong superconducting quantum computer. The system acts like a "fast lane" for data transmission, helping address a key challenge in scaling up QRAM.

Researchers built three independent quantum routers and a two-layer quantum routing network on China's third-generation independent superconducting quantum computer Origin Wukong for testing. The results showed that a single quantum router achieved an information transmission efficiency of up to 98 percent, while the two-layer network reached an overall transmission efficiency of 93 percent. In random-access tests, the average fidelity reached 94.8 percent for the single quantum router and 82.4 percent for the two-layer network.