Achieve “quantum hegemony”?The “Nine Chapters” of Zhongke’s large number of sub-computing prototypes come out

According to a news from the University of Science and Technology of China on December 4, a research team composed of Pan Jianwei, Lu Chaoyang and others, in cooperation with the Shanghai Institute of Microsystems of the Chinese Academy of Sciences and the National Center for Parallel Computer Engineering and Technology, constructed 76 photon quantum computing prototypes. chapter”. Related papers were published online in the international academic journal “Science” on December 4.

The “Nine Chapters” solve the mathematical algorithm Gaussian Bose sampling in only 200 seconds, while the world’s fastest supercomputer currently takes 600 million years. Xinhua News Agency reported that this breakthrough made my country the second country in the world to achieve “quantum superiority” (also known as “quantum hegemony”).

In principle, quantum computers have ultra-fast parallel computing capabilities. It is expected that certain algorithms can be implemented in comparison with classic computers in some issues with significant social and economic value (such as password deciphering, big data optimization, material design, drug analysis, etc.) Exponential acceleration. At present, the development of quantum computers has become one of the biggest challenges at the forefront of science and technology in the world, and has become the focus of competition among developed countries in Europe and the United States.

Pan Jianwei’s team has always been at the international leading level in optical quantum information processing. In 2017, the team built the world’s first optical quantum computing prototype that surpassed the early classical computer (ENIAC). In 2019, the team further developed the world’s highest performance single-photon source with deterministic polarization, high purity, high identity and high efficiency, and realized the Bose sampling of 20-photon input and 60-mode interference circuit, and the output complexity is equivalent to 48 quantum Bit’s Hilbert state space approaches the “superiority of quantum computing.”

Recently, the team independently developed a quantum light source with high efficiency, high identity, extremely high brightness, and large-scale expansion capability, while satisfying phase stability, fully connected random matrix, wave packet coincidence degree better than 99.5%, and excellent pass rate. In 98% of the 100-mode interference circuit, the relative optical path length is within 10-9, the phase-locked precision, high-efficiency 100-channel superconducting nanowire single-photon detector, successfully constructed 76 photons 100-mode Gaussian Bose sampling quantum calculation The prototype “Nine Chapters” (named “Nine Chapters” is to commemorate the earliest mathematics monograph “Nine Chapters of Arithmetic” in ancient China).

The reviewers of “Science” evaluated the work as “a state-of-the-art experiment” and “a major achievement”. The researchers hope that this work can stimulate more work in the simulation of classic algorithms, and it is expected that there will be room for improvement in the future. Quantum superiority experiments are not an overnight task, but a competition between faster classical algorithms and ever-increasing quantum computing hardware, but in the end, quantum parallelism will produce computing power that classical computers cannot match.

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