Chinese scientists have produced a chip that is significantly faster and more energy-efficient than current high-performance AI chips for some tasks such as image recognition and autonomous driving, according to a new study. Although the new chip cannot immediately replace those used in devices such as computers or smartphones, it may soon be used in wearable devices, electric cars or smart factories, and help boost China’s competitiveness in the mass application of artificial intelligence (AI), researchers wrote in a paper published in the journal Nature. The country is scrambling to catch up in the AI race with the United States after Washington introduced a series of curbs on China’s access to technology, including advanced chips. The new chip – known as the All-Analogue Chip Combining Electronics and Light (ACCEL) – is light-based and uses photons for computing and transmitting information to achieve a faster computing speed.
The idea of a light-based chip is not new, but the chips currently in use rely on electric current for calculation because photons are more challenging to control. In a laboratory test, the new chip reached a computing speed of 4.6 peta-floating point operations per second (PFLOPS), 3,000 times faster than one of the most widely used commercial AI chips, Nvidia’s A100. The Chinese chip also consumes 4 million times less energy, researchers found. The A100 is subject to U.S. sanctions on China and is produced with advanced lithography machines to which China does not have access. The new chip was instead built by China’s Semiconductor Manufacturing International Corp (SMIC) using a cheap 20-year-old transistor fabrication process.
“The performance of the chip could be further optimized through improvements in the building process or by adopting more expensive fabrication processes under 100 nanometers,” the research team from Tsinghua University’s Automation and Electronic Engineering Departments wrote in the paper. Unlike semiconductor chips, photonic chips use the intrinsic physical properties of light by replacing transistors with ultramicroscopes and electrical signals with light signals. “Deployment of photonic computing systems used to be a challenge due to the complicated structural design and vulnerability to noise and system errors. The team introduced a computing framework that fuses photonic and analogue electronic computing,” it was explained on Tsinghua’s website. Using light signals also greatly increased energy efficiency and “the energy required to operate existing chips for an hour could power ACCEL for over 500 years”.
Its low power consumption may also help overcome the problem of heat dissipation, which currently complicates further miniaturizing integrated circuits. However, the chip’s analogue computing architecture limits its application to solving specific problems and it cannot run various programs or compress files like general computing chips in smartphones. The tasks it can perform include high-resolution image recognition, lowlight computation and identifying traffic, according to Tsinghua’s website. It also has certain advantages when it comes to AI vision because passive light from the environment carries information itself allowing it to compute directly during the sensing process, the South China Morning Post reports.
