Comparing Zuchongzhi-3 and Google Quantum Computers

In early March 2025, researchers from the University of Science and Technology of China (USTC) announced the development of the advanced superconducting quantum computer Zuchongzhi-3, which is claimed to lay the foundation for an entirely new era of computing. According to the developers, Zuchongzhi-3 is a million times faster than Google’s Sycamore quantum processor. Zuchongzhi-3 features 105 qubits, compared to 54 qubits in Google Sycamore. Chinese researchers state that, for certain tasks, the new quantum system outperforms the most powerful modern supercomputers with conventional architectures by 15 orders of magnitude. Zuchongzhi-3 has been tested on random quantum circuit sampling tasks. The device demonstrates a coherence time of 72 microseconds, single-qubit gate fidelity of approximately 99.9%, and two-qubit gate fidelity of 99.62%. The parallel readout accuracy reaches 99.13%.

The US—nor any other country or continent—has a moat when it comes to Quantum Computing. China’s 105-qubit superconducting quantum processor, 𝗭𝘂𝗰𝗵𝗼𝗻𝗴𝘇𝗵𝗶 3.0, makes it strikingly clear why. As a physicist, I admire how transparently the Chinese research team has shared the details of their hardware innovations. 𝗨𝗻𝗱𝗲𝗿 𝘁𝗵𝗲 𝗛𝗼𝗼𝗱: - 105 transmon qubits arranged in a 15x7 lattice, connected by 182 flux-tunable couplers for dynamic gate operations. - Modular flip-chip design using indium bump bonds, with superconducting films of tantalum and aluminum to reduce dielectric losses. - Qubit relaxation times (T₁) of 72 µs and dephasing times (T₂, CPMG) at 58 µs—matching Google's Willow chip performance. 𝗦𝘁𝗮𝗻𝗱𝗼𝘂𝘁 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗙𝗲𝗮𝘁𝘂𝗿𝗲𝘀: - High-fidelity gate operations with 99.90% for single-qubit gates and 99.62% for two-qubit gates. - Readout error rates as low as 0.82%, achieved through high coupling strength (~130 MHz) and optimized readout resonator linewidths (~10 MHz). - Clever signal management: Modular cryogenic wiring with just 332 cables and robust readout using TWPAs, HEMTs, and bandpass filters. - A smart "4-patch" calibration method allows dynamic gate tuning and accurate error estimation, even for large circuits. 𝗧𝗵𝗲 𝗘𝘅𝗽𝗲𝗿𝗶𝗺𝗲𝗻𝘁: Zuchongzhi 3.0 showcased its capabilities through large-scale random circuit sampling, running circuits with up to 83 qubits and 32 cycles deep. They used structured gate sequences (patterns ABCD-CDAB) to maintain coherence and minimize errors. 𝗧𝗵𝗲 𝗥𝗲𝘀𝘂𝗹𝘁: They performed tasks that would take Frontier, one of the world’s fastest supercomputers, approximately 6.4 billion years to replicate classically. The world tends to overlook China’s quantum progress until it becomes impossible to ignore. Yet here it is, openly shared—beautifully showcasing what superconducting quantum processors can achieve today. 📸 Credits: Dongxin Gao et al. (2025) IBM Google Microsoft Alibaba Group IQM Quantum Computers

China’s University of Science and Technology (USTC) has announced a major breakthrough in quantum computing with the debut of Zuchongzhi-3, a superconducting quantum processor that reportedly performs one quadrillion times faster than the world’s top classical supercomputers. Featuring 105 qubits and 182 couplers, Zuchongzhi-3 marks a dramatic leap forward, surpassing Google’s Sycamore processor—which achieved quantum supremacy in 2019 with 67 qubits—by a significant margin in benchmark tasks like random quantum circuit sampling. This milestone underscores China’s rapid ascent in the global race to dominate quantum computing, a field widely considered the next frontier of technological and strategic power. Quantum computing aims to solve problems far beyond the capabilities of today’s most powerful machines by leveraging the quantum properties of materials. While exascale supercomputers are only now reaching their peak in classical computing, quantum systems like Zuchongzhi-3 offer exponentially greater processing power for specialized tasks. In tests, Zuchongzhi-3 demonstrated an ability to handle calculations that would take traditional supercomputers years to complete, in mere seconds. This breakthrough suggests that China is not only closing the gap with U.S. efforts led by Google and IBM but may have taken the lead in realizing practical quantum computing at scale. The international scientific consensus outlines three primary stages of quantum computing development: achieving quantum supremacy (where quantum systems outperform classical ones in specific tasks), developing quantum simulators with hundreds of qubits for solving real-world problems, and advancing precision and error correction to achieve stable, fault-tolerant systems. With Zuchongzhi-3, China appears to have made significant progress toward the second stage, as the system’s increased qubit count and complexity suggest it could begin tackling practical applications in fields such as cryptography, pharmaceutical design, logistics optimization, and materials science. Beyond scientific achievement, Zuchongzhi-3 carries geopolitical weight. Quantum computing is widely viewed as a strategic technology with the potential to reshape cybersecurity, economic modeling, and national defense. The U.S. and China are locked in a high-stakes competition to establish dominance in this space, with global implications for technological leadership and security. As China accelerates its investments and continues to deliver breakthroughs like Zuchongzhi-3, the urgency for other nations to match these advances grows. This development not only signals a leap forward in quantum capability but also a new phase in the geopolitical rivalry over the technologies that will define the future.