Science and Technology Daily, Hefei, October 26 (Reporter Wu Changfeng) The reporter learned from the University of Science and Technology of China on the 26th that Pan Jianwei, Lu Chaoyang, Liu Naile, etc. of the Institute of Quantum Information and Quantum Science and Technology Innovation of the Chinese Academy of Sciences have cooperated with domestic teams to develop quantum light sources. The theory and experimental method of excitation amplification, the construction of 113 photon 144 mode quantum computing prototype "Nine Chapter 2", and the realization of the phase programmable function, completed the demonstration of the "superiority of quantum computing" Gaussian glass Fast solution of color sampling tasks.

The relevant papers were published in the internationally renowned academic journal "Physics Review Letters" on October 26, 2021 in the form of "Editor's Recommendation".

  The physical realization of large-scale quantum computers is one of the major challenges at the forefront of world science and technology.

The physical realization of quantum computing is a three-step roadmap adopted by the international academic community.

Among them, the first milestone is academically called the "superiority of quantum computing". Its meaning is to manipulate nearly a hundred physical bits with high precision to efficiently solve specific problems that cannot be solved by supercomputers in a reasonable time. And challenge the “extended Church-Turing thesis”.

  In 2020, Pan Jianwei’s team successfully constructed the “Nine Chapters” of the Gaussian Bose sampling quantum computing prototype with 76 photons and 100 modes. The processing speed of Gaussian Bose sampling is one trillion times faster than that of supercomputers.

On the basis of the "Nine Chapters", the researchers designed and realized the stimulated dual-mode quantum compression light source, which significantly improved the yield, quality and collection efficiency of the quantum light source.

Secondly, through the compact design of the three-dimensional integration and collection optical path, the multi-photon quantum interference circuit has increased to 144 dimensions.

As a result, the number of photons detected by "Nine Chapter 2" increased to 113, and the dimension of the output state space reached 10 to the 43th power.

Furthermore, by dynamically adjusting the phase of the compressed light, the researchers realized the reconfiguration of the Gaussian Bose sampling matrix, demonstrating the programming ability of "Nine Chapter Two" to solve mathematical problems with different parameters.

  According to the best classical algorithm theory that has been officially published, "Nine Chapter 2" can process Gaussian Bose sampling faster than the current fastest supercomputer by 10 times and 24 times.

This achievement has once again refreshed the international technical level of optical quantum manipulation.

Barry Sanders, a well-known quantum physicist and professor at Calgary University in Canada, was also invited to transcribe a long review article on the Physics website, praising the work as an "exciting experimental masterpiece and impressive cutting-edge progress."

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