Chinese Team Reports Jiuzhang 4.0 Injected 1,024 Squeezed States Into 8,176-Mode Processor
Updated
Updated · Quantum Zeitgeist · Sep 5
Chinese Team Reports Jiuzhang 4.0 Injected 1,024 Squeezed States Into 8,176-Mode Processor
2 articles · Updated · Quantum Zeitgeist · Sep 5
Summary
Jiuzhang 4.0 was reported in Nature on May 13 with 1,024 squeezed states fed into an 8,176-mode photonic processor, marking the latest iteration of China’s boson-sampling machine.
The upgrade was designed to benchmark against spoofing algorithms that had weakened earlier Jiuzhang advantage claims after classical methods cut supposed billion-year tasks to days and later mimicked many early experiments.
Unlike superconducting or trapped-ion systems, the photonic platform computes with light in programmable waveguide chips, with measurement central to the design and optical loss—not electrical noise—the main engineering constraint.
The result still sits in the narrow boson-sampling category rather than universal quantum computing, and no photonic platform has yet published a peer-reviewed logical qubit despite commercial roadmaps targeting the late 2020s.