"Zuchong-2" realizes the superiority of superconducting system "quantum computing"

Science and Technology Daily Hefei, October 26 (Reporter Wu Changfeng) On the 26th, the reporter learned from the University of Science and Technology of China that the research team composed of Pan Jianwei, Zhu Xiaobo, Peng Chengzhi and other members of the Institute of Quantum Information and Quantum Science and Technology Innovation of the Chinese Academy of Sciences cooperated with the Shanghai Institute of Technical Physics of the Chinese Academy of Sciences to build a 66-bit programmable superconducting quantum computing prototype "Zu chong No. 2", realizing the rapid solution of the "quantum random line sampling" task. The relevant results of the paper were recently published in the "Physical Review Letters" and "Scientific Bulletin".

The superiority of quantum computing is the first milestone in the development of quantum computing, and reaching this milestone requires coherent manipulation of more than 50 qubits. Superconducting qubits are internationally recognized as one of the physical systems that promise to enable scalable quantum computing. Pan Jianwei and others have long aimed at the field of superconducting quantum computing, the team on the basis of the "Zu Chong No.", the use of a new flip-mount welding 3D packaging process, to solve the problem of large-scale bit integration, the successful development of "Zu Chong No. 2", to achieve 66 data bits, 110 coupled bits, 11 ways to read the high-density integration, the maximum state space dimension reached 10 to the 19th power. Zuchong No.2 adopts an adjustable coupling architecture to achieve fast and accurate adjustment of the coupling intensity between bits, which significantly improves the fidelity of parallel quantum gate operation. Through quantum programming, the researchers achieved sampling of quantum random lines, demonstrating the programming ability of Zuchong-2 to execute arbitrary quantum algorithms.

According to the existing theory, the speed of the quantum random line sampling problem handled by "Zuchong-2" is 7 orders of magnitude faster than the current fastest supercomputer, and the computational complexity is 6 orders of magnitude higher than the 53-bit superconducting quantum computing prototype "planewood" publicly reported by Google, which is the first time that China has reached the "quantum computing superiority" milestone in the superconducting qubit system after the "nine chapters" of the optical quantum computing prototype, making China the only country that has reached this milestone in both physical systems at the same time.

The successful demonstration of the superiority of "Zuchong No. 2" quantum computing has laid the foundation for quantum error correction and further realization of general-purpose quantum computing. Its parallel high-fidelity metric subgate manipulation capabilities and fully programmable capabilities are expected to find practical applications in specific fields, including quantum machine learning, quantum chemistry, and quantum approximation optimization.

Source: Science and Technology Daily