China Achieves 98% Quantum Routing Efficiency on Wukong Superconducting Platform

Researchers in China have demonstrated a quantum router achieving 98% information transmission efficiency on the Origin Wukong superconducting quantum computer—the nation’s third-generation, independently developed system. The result marks a step toward scalable quantum random access memory (QRAM) architectures.

Routing quantum information

The coherent routing system was developed and tested by multiple Chinese research teams for bucket-brigade QRAM applications, according to Science and Technology Daily’s Wednesday report. Rather than evaluating an isolated component, the teams constructed three independent quantum routers and integrated them into a two-layer network to assess performance across increasing architectural complexity.

This layered configuration enabled direct comparison between single-unit operation and multi-stage routing. The system functions as a “fast lane” for quantum data transmission, specifically engineered for implementation on existing superconducting hardware platforms.

Each of the three routers was evaluated individually before being linked into the two-layer arrangement. That design allowed researchers to isolate unit-level behavior while also measuring how signal integrity degrades—or holds—across cascaded routing stages.

Transmission and fidelity results

Transmission efficiency reached 98% for a single quantum router. Across the full two-layer network, overall transmission efficiency measured 93%. Random-access fidelity tests yielded an average of 94.8% for the standalone router and 82.4% for the two-layer configuration.

These fidelity figures are distinct from transmission efficiency metrics. The 98% value applies exclusively to the individual router’s transmission performance—not to the entire network or to the Origin Wukong system’s broader operational capabilities.

Both transmission efficiency and fidelity declined in the two-layer setup relative to the single-router test. Still, the experiments confirmed functional quantum routing at two levels of structural complexity on identical superconducting hardware.

A path toward scalable memory

The breakthrough provides a foundation for building scalable QRAM using current superconducting quantum computing infrastructure. It moves beyond optimizing isolated components toward integrating routing functionality into larger, interconnected quantum memory systems.

The work reflects a broader strategic shift in China’s quantum computing research: increased emphasis on executing complex quantum functions on physical machines, alongside continued refinement of discrete performance indicators.

Potential advantages cited include reduced computational overhead, improved system efficiency, and tighter alignment between quantum chip architecture and circuit-level design requirements. These benefits extend beyond the specific transmission and fidelity values reported in the experimental trials.

To date, the achievement remains a fully implemented coherent quantum routing system—validated through both individual router tests and coordinated operation across a two-layer network on Origin Wukong.