“Jiuzhang III” is a significant photonic quantum computer prototype
The “Jiuzhang III” is a significant photonic quantum computer prototype developed by a team led by renowned Chinese physicist Pan Jianwei at the University of Science and Technology of China (USTC). Announced in October 2023, it represents a major advancement in China’s quantum computing capabilities.
Key Features and Performance:
Photon-Based: Unlike superconducting quantum computers like Google’s Sycamore or China’s own Zuchongzhi series, Jiuzhang III utilizes photons (particles of light) as its fundamental units of quantum information (qubits).
Boson Sampling: It was designed to perform a specific, complex quantum computation called Gaussian Boson Sampling (GBS). While GBS might not be directly applicable to all real-world problems, it’s a crucial benchmark for demonstrating quantum computational advantage – the point at which a quantum computer can perform a task far beyond the capabilities of even the most powerful classical supercomputers.
Record-Breaking Photon Detection: Jiuzhang III achieved a record by detecting 255 photons in its boson sampling experiment. This is a significant increase from its predecessors, Jiuzhang (76 photons in 2020) and Jiuzhang 2.0 (113 photons in 2021).
Unprecedented Speedup: The researchers demonstrated that Jiuzhang III could solve the GBS problem 10 quadrillion (10^16) times faster than the world’s fastest classical supercomputer, the Frontier. To put this in perspective, the most complex outputs from Jiuzhang III would take Frontier an estimated 10^10 years to simulate exactly.
Million Times Faster Than Jiuzhang 2.0: Compared to its immediate predecessor, Jiuzhang 3.0 is reportedly one million times faster at processing Gaussian boson sampling tasks.
Novel Detection System: A key innovation in Jiuzhang III is its “pseudo-photon-number-resolving” detection system. This system uses an array of superconducting nanowire single-photon detectors (SNSPDs) with a fiber loop delay network to effectively count multiple photons arriving simultaneously, overcoming a limitation of previous photonic systems.
Significance:
Further Establishes China as a Leader in Quantum Computing: Jiuzhang III reinforces China’s position as a leading nation in the race to develop powerful quantum computers, particularly in the field of photonic quantum computing.
Demonstrates Scalability of Photonic Approach: The ability to control and detect such a large number of photons showcases the continued scalability of photonic quantum computing, offering a different pathway compared to superconducting and trapped-ion technologies.
Raises the Bar for Quantum Advantage: Jiuzhang III significantly widens the gap in performance between quantum computers and classical supercomputers for this specific type of problem.
Limitations and Future Outlook:
Task-Specific: Like its predecessors, Jiuzhang III excels at boson sampling, which is not a universal quantum computing task. The development of fault-tolerant, universal quantum computers capable of tackling a broader range of real-world problems remains a long-term goal.
Continued Development Needed: While a remarkable achievement, Jiuzhang III is a prototype. Further research and engineering are necessary to build more stable, versatile, and error-corrected quantum computers.
I can think of one task I would use this computer for.
China’s rocket launches
Another one. China successfully launched the Lijian-1 Y7 carrier rocket with six satellites onboard on Wednesday, May 21, 2025.
The launch took place from a commercial aerospace innovation pilot zone in northwest China, and the satellites were successfully sent into their planned orbits. This mission marks the seventh flight of the Lijian-1 carrier rocket series.
The six satellites launched were: Taijing-3 04, Taijing-4 02A, Xingrui-11, Xingjiyuan-1, Lifang108 001, and Xiguang-1 02.
Another one on the same day. On Monday, May 19, 2025, a CERES-1S Y5 commercial carrier rocket, developed by the private firm Galactic Energy, lifted off from a sea platform near Shandong Province, China.
The rocket successfully sent four Tianqi satellites (Tianqi 34 to 37) into a low Earth orbit. These satellites are part of the Tianqi Constellation, which is being built and operated by Guodian Gaoke. The Tianqi constellation is a series of experimental Low Earth Orbit (LEO) communication satellites primarily for Internet-of-Things (IoT) communications. They are designed to provide data collection and transmission services for terrestrial network coverage blind spots, with applications in various industries such as marine, environmental protection, meteorology, forestry, emergency response, and smart cities. Some of these satellites also carry cameras for educational purposes.
This launch is significant as it marks the completion of the first phase of the Tianqi constellation, establishing China’s first low Earth orbit IoT constellation. It also highlights the growing capabilities of China’s private aerospace companies in conducting commercial sea launches.
May 19, 2025. A maritime rocket launched successfully from the Yellow Sea waters off Rizhao, Shandong province, China. This area is becoming an established site for China’s sea-based rocket launches. The rocket used for this mission was a Long March CZ-11 solid-propellant carrier rocket. This type of rocket is often used for rapid deployment of satellites from mobile sea platforms. The primary payload for this mission was a new Earth observation satellite named “Qingdao-6” (青岛六号). This satellite is expected to be used for various applications, including urban planning, environmental monitoring, and disaster management. Chinese state media has officially declared the launch a complete success, with the satellite successfully entering its intended orbit.
“China’s tree limbing laser” is an emerging technology
“China’s tree limbing laser” is an emerging technology primarily aimed at remote obstacle removal and precise pruning, especially around power lines. It’s often referred to as a “laser cannon,” “laser obstacle remover,” or “laser tree pruning machine.”
Primary Application
The main driving force behind the development and deployment of these laser systems in China appears to be utility maintenance, specifically clearing branches, kites, plastic bags, bird nests, and other non-metallic foreign objects that obstruct power lines or railways. This is a critical safety and efficiency issue for power grids.
Key Features and Advantages
Remote, Non-Contact Operation: This is the most significant advantage, eliminating the need for personnel to climb trees or use cranes, greatly reducing risks of electric shock and falls.
High Precision: Lasers allow for very precise cutting, targeting only the necessary parts of a tree and minimizing damage to the overall tree health.
Efficiency and Speed: These laser systems can cut a 10 cm diameter tree branch in as little as one or two minutes, a task that might take hours with traditional methods.
Safety Features: Many systems incorporate features like radar alarms to prevent people from entering the laser path, electronic fences, and automatic power cut-offs if an intrusion is detected.
Environmental Friendliness: They are a non-polluting energy source, producing no harmful gases or waste.
Versatility: While primarily for utility lines, they can also be applied in landscaping, forestry, and even for removing objects from high-voltage devices.
Portability: Some models are designed to be relatively lightweight and portable for outdoor work.
Technical Specifications
Power: Common laser power options range from 200W to 1000W. Systems with power outputs of 1500W (and even higher, up to 4000W) are being used or are available from Chinese manufacturers.
Effective Working Distance: These devices can effectively cut from distances of 10 to 300 meters.
Wavelength: Often use a wavelength around 1080±10nm (Fiber laser) or 10640±5nm (CO2 laser).
Components: Typically consist of a laser generator, transmitter, high-precision gimbal (for aiming), controller, high-definition sight, and a power supply (often battery-powered for portability).
Developers and Manufacturers
Companies like Dowell Laser and SPT Laser are prominent Chinese manufacturers developing and marketing these “laser cannon” systems. There are also mentions of Dongguan Power Supply Bureau developing fifth-generation laser obstacle removers. One company in Chengdu specifically mounting a “tree limbing laser” for commercial forestry/utility use on a robot dog.
Limitations/Considerations
Cost: These are relatively high-budget tools, not suitable for typical home use.
Thermal Damage to Trees: Laser cutting generates high temperatures, which can leave scorch marks or scars, potentially affecting the tree’s health and healing process.
Safety Training: Due to the inherent danger of Class 4 lasers, operation requires trained professionals and strict adherence to safety protocols.
DJI Mavic 4 Pro
Huawei MateBook Fold Ultimate Design
AG600-1101 aircraft
May 18, the AG600-1101 aircraft, piloted by the test flight crew, took off from Zhuhai Jinwan Airport and completed a 12-ton water drop verification. After a 17-minute flight, it landed smoothly. The aircraft’s condition was good, the control system was normal, and all systems operated stably.