Full Breakdown
Chinese Photonic Quantum Computer Jiuzhang 4.0 Sets New World Record
5/15/2026, 11:47:09 AM
Jiuzhang 4.0 Achieves Unprecedented Speed in Gaussian Boson Sampling
A team led by the University of Science and Technology of China (USTC) announced that its programmable optical quantum computer prototype, Jiuzhang 4.0, solved the Gaussian boson sampling problem at a speed estimated to be 10^54 times faster than the world’s most powerful classical supercomputer. Described in *Nature* on 13 May 2026, the experiment manipulated and detected quantum states of up to 3,050 photons, far above the 255 photons used by Jiuzhang 3.0.
Development and Quantum-Advantage Goal
Jiuzhang 4.0 is the fourth generation of USTC’s photonic quantum-computing line, named after the ancient Chinese text *Jiuzhang Suànshù*. Each version has expanded photon-handling capacity, with Jiuzhang 4.0 increasing it roughly twelvefold. The project aims to demonstrate “quantum advantage,” where a quantum device solves a problem infeasible for any classical machine. Gaussian boson sampling serves as a standard benchmark for this advantage.
Performance Metrics
The prototype manipulated and detected 3,050 photons, compared with 255 photons in Jiuzhang 3.0, and achieved a speed advantage of roughly 10^54 over the fastest classical supercomputer. For scale, 10^54 is a 1 followed by 54 zeros, far exceeding the estimated 10^24 stars in the observable universe. This performance marks a milestone in optical quantum computing.
Official Summary from the Research Team
The *Nature* article reports that the researchers “manipulated and detected quantum states of up to 3,050 photons” and that the system’s performance on Gaussian boson sampling “exceeds the speed of the world’s most powerful supercomputer by a factor of 10^54.” The authors present this as evidence that Jiuzhang 4.0 demonstrates quantum advantage in optical quantum computing.
Verification Gaps
The *Nature* paper details the methodology, but external replication has not yet been reported. Independent labs will need to reproduce the photon-handling and sampling results to confirm the advantage and assess reproducibility.
Implications for Science and Industry
Jiuzhang 4.0’s record positions China as a leading contender in the global quantum-computing race, alongside U.S. work on superconducting qubits and ion traps. The speed advantage could accelerate cryptography, drug discovery, climate modeling, and logistics optimization, turning tasks that now take days or weeks on classical supercomputers into minute-scale calculations.
Future Directions
The team describes Jiuzhang 4.0 as a prototype, not a commercial product. Future work will scale photon numbers, reduce errors, and integrate the system into practical algorithms. Continued public and private investment in China, and the announcement’s impact on U.S. funding, suggest accelerated development and international collaborations.
