my country successfully developed 62-bit quantum computing prototype "Zuchongzhi"

On quantum computers, our scientific research team has achieved another breakthrough. The University of Science and Technology of China has successfully developed the 62-bit programmable superconducting quantum computing prototype "Zuchongzhi", which has the largest number of superconducting qubits in the world.

According to news from the University of Science and Technology of China, a research team composed of Pan Jianwei, Zhu Xiaobo, and Peng Chengzhi of the Institute of Quantum Information and Quantum Technology Innovation of the Chinese Academy of Sciences (hereinafter referred to as the Institute of Quantum Innovation) has successfully developed a 62-bit programmable superconducting quantum computing prototype "Zu Chongzhi" Number", and on this basis, a programmable two-dimensional quantum walk has been realized.

Related research results will be published online in the international academic journal "Science" on May 7, 2021.

Pan Jianwei, Zhu Xiaobo, Peng Chengzhi and others have long aimed at the above-mentioned core goals of superconducting quantum computing and have made a series of important progress.

At the beginning of 2019, the preparation of 12 qubit entangled "cluster states" on a one-dimensional chain structure 12-bit superconducting quantum chip, with a fidelity of 70% (Phys. Rev. Lett. 122, 110501 (2019)), It broke the previous record of 10 superconducting qubits entangled.

At the same time, the team pioneered the application of superconducting qubits to the study of quantum walks, laying a foundation for the simulation of future multi-body physical phenomena and the research of general quantum computing using quantum walks (Science 364, 753 (2019)) .

Subsequently, the team expanded the chip structure from one-dimensional to quasi-two-dimensional, prepared a high-performance superconducting quantum processor containing 24 bits, and for the first time achieved high-precision quantum coherent control of more than 20 bits in a solid-state quantum computing system. (Phys. Rev. Lett. 123, 050502 (2019)).

Recently, based on the independent development of a two-dimensional structure superconducting qubit chip, the team successfully constructed the world’s largest number of superconducting qubits, including 62 bits, a programmable superconducting quantum computing prototype "Zuchongzhi", and A demonstration of a two-dimensional programmable quantum walk was successfully carried out on this system.

The research team observed the quantum walk phenomenon under single-particle and double-particle excitation on a superconducting qubit chip with a two-dimensional structure, and experimentally studied the propagation speed of quantum information on a two-dimensional plane, and at the same time modulated the topological structure of the qubit connection The Mach-Zehnder interferometer is constructed in a way to realize a programmable two-particle quantum walk.

This achievement lays a technical foundation for the realization of quantum superiority display on superconducting quantum systems and quantum computing research that can solve problems of great practical value.

In addition, the two-dimensional programmable quantum walk based on the "Zuchongzhi" quantum computing prototype has potential applications in quantum search algorithms, general quantum computing and other fields, and will be an important direction for subsequent development.

In principle, quantum computers have ultra-fast parallel computing capabilities, and 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 is one of the major challenges facing the frontiers of science and technology in the world, and has become the focus of competition among developed countries in Europe and the United States. Superconducting quantum computing, as one of the most promising candidates for the realization of scalable quantum computing, its core goal is how to increase the number of integrated qubits simultaneously and improve the performance of superconducting qubits, so as to be able to control more accurately and coherently. The qubits achieve exponential acceleration in the processing speed of specific problems, and finally apply them to practical problems.

【Editor's Choice】