China Quantum Technology Developed by the USTC Now Rivals Google
China Quantum Technology Developed by the USTC Now Rivals Google
Synopsis
- Chinese researchers demonstrate stabilised superconducting quantum computing using an all-microwave control method.
- The Zuchongzhi 3.2 system crosses the fault-tolerant error-correction threshold previously achieved only by Google.
- The approach matches leading surface-code performance while reducing hardware complexity and wiring constraints.
Estimated reading time: 3 mins read
Researchers at the University of Science and Technology of China have reported a major advance in the global effort to build practical quantum computers, marking the first time a team outside the United States has demonstrated fault tolerance in a superconducting quantum system. The work, led by Pan Jianwei, shows that the university’s Zuchongzhi 3.2 quantum computer has crossed the fault-tolerant threshold, a critical point at which the process of correcting errors makes the system more stable rather than introducing additional faults.
According to reporting by the South China Morning Post, this milestone has been reached only once before, by Google, making the Chinese result the second such demonstration globally. The findings were published in Physical Review Letters, underscoring their significance to the international quantum-computing community.
Quantum computers differ fundamentally from classical machines by using quantum bits, or qubits, instead of binary bits. While classical bits exist as either 0 or 1, qubits can occupy combinations of both states simultaneously, dramatically increasing potential computing power. This advantage, however, comes with a persistent challenge: qubits are highly sensitive to environmental noise and tend to drift from their intended states, allowing errors to spread quietly through a computation.
To address this, researchers rely on quantum error-correction techniques, which may be hardware-based, software-based, or a combination of both. A common strategy is to distribute information across multiple physical qubits so that errors can be detected and corrected. Yet this introduces a paradox: adding more qubits can also create more opportunities for errors. As a result, scientists focus on a tipping point known as the error-correction or fault-tolerant threshold. Below this threshold, error correction can worsen performance; above it, increasing the size of the correction code reduces errors and stabilises the system, making large-scale quantum computing theoretically feasible.
Both China and the United States have invested heavily in surface-code error correction, the most widely used framework in the field. In 2022, Pan Jianwei’s team at USTC demonstrated a proof of principle by creating a distance-3 surface-code logical qubit, representing the smallest unit capable of correcting errors. The following year, Google advanced the state of the art by achieving distance-5 surface-code error correction. Earlier this year, Google went further, with its Willow quantum processor demonstrating a distance-7 surface-code logical qubit, showing that adding qubits could exponentially reduce error rates.
However, as described by the Chinese team in comments reported by the South China Morning Post, Google’s approach required tight constraints on chip design and increasingly complex wiring within ultra-low-temperature environments. Such hardware demands raise concerns about scalability as systems grow larger.
In contrast, the USTC researchers adopted an all-microwave approach to error suppression. Rather than relying on extensive hardware redundancy, their method uses microwave-based control to manage and correct errors within the surface-code framework. Because microwave signals can be multiplexed and transmitted through the same physical wiring, the approach reduces hardware overhead and relaxes chip-design constraints.
Using this method, the team successfully achieved a distance-7 surface-code logical qubit, matching Google’s most advanced publicly reported result. They also measured an error-suppression factor of 1.4, meaning that increasing the size of the error-correction code reduced the overall error rate instead of amplifying it. Crossing this threshold demonstrates that error correction is functioning as intended and that further scaling could, in principle, continue to improve reliability.
Writing in the American Physical Society’s Physics magazine, Joseph Emerson, a physicist at the University of Waterloo who was not involved in the research, described the experiment as “an impressive feat.” At the same time, he cautioned that the system remains far from the scale required for practical, real-world applications, noting that significant engineering challenges remain before fault-tolerant quantum computers can be deployed commercially.
Still, the results highlight China’s growing role in the highly competitive field of quantum computing and point to an alternative path toward scalability. By demonstrating that fault tolerance can be achieved without the same degree of hardware complexity used by Google, the USTC work suggests that large-scale quantum machines, potentially incorporating even millions of qubits, may be achievable in the future. While practical applications remain distant, the experiment represents a meaningful step toward solving one of quantum computing’s most fundamental design challenges and reinforces the intensifying international race to build reliable, fault-tolerant quantum systems.
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About The University of Science and Technology of China (USTC)
University of Science and Technology of China (USTC) is a leading research university recognised for its contributions to frontier science and advanced engineering. The institution plays a central role in China’s national quantum programme, hosting long-running research in superconducting quantum computing, photonic systems, and quantum communication. Under the leadership of physicist Pan Jianwei, USTC teams have delivered multiple globally visible milestones, including the Zuchongzhi series of superconducting quantum processors and earlier demonstrations of surface-code error correction.
The university combines fundamental physics with systems engineering, focusing on scalability, control electronics, and error management rather than laboratory-only proofs. Its work is frequently published in top peer-reviewed journals and cited by international researchers, reflecting close engagement with the global quantum community. Beyond quantum computing, USTC maintains strong capabilities in materials science, information science, and applied mathematics, supporting interdisciplinary research aimed at translating theoretical advances into practical, large-scale technologies for future industrial and scientific.
Featured image Source: Al Jareeza
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