# Significant breakthroughs have been made in large-scale quantum computing and simulation research of the Science and Technology of China

Source:Central Radio and Television International Online

Editor:Zhao Yan

The one-dimensional lattice Schwinger model describes the interaction between positive and negative particles through electric field transfer, and positive and negative particles After annihilation, it is transformed into electric field excitation. The one-dimensional Hubbard model describes the process of tunneling and interaction of cold atoms in a light lattice. Under a specific potential well shape, one The group symmetry of the three-dimensional Hubbard model is the same as that of the Schwinger model

Schematic diagram:Gauge field theory describes the interaction, generation and annihilation process between elementary particles. This process can be used between ultracold atoms in the lattice The interaction and its arrangement in the lattice are simulated. (Drawing Shi Qianhui, Liang Yan)

International Online Report (Reporter Li Lin):On November 19th, Beijing time,”Nature” magazine published the Professor of University of Science and Technology of China Pan Jianwei, Yuan Zhensheng, and other recent research advances, solved the Schwinger equation in a 71-site ultra-cold atom quantum simulator. This achievement successfully solved complex physics problems using large-scale quantum computing and quantum simulation methods.

It is reported that the research team has cooperated with German and Italian scientists to develop a dedicated quantum computer-a 71-site ultra-cold atomic optical lattice quantum simulator, which successfully simulates the quantum electrodynamic equations through precise control The Schwinger model simulates the interaction and transformation between the gauge field and the matter field for the first time by manipulating the ultracold atoms bound in it, and observes the local gauge invariants, and uses the microscopic quantum control method for the first time in the quantum multibody The Gauss theorem describing the relationship between charge and electric field is verified in the system.

The reviewers of”Nature” highly praised:”This is an important milestone in the study of the lattice gauge field by the quantum simulation method. It will attract the attention of many disciplines, from elementary particles, crystals Theorists in the field of lattice gauge field and quantum information, to experimental physicists in the fields of atomic and molecular optics and solid-state physics.”;”A real step in the simulation of lattice gauge field theory:from the realization of the quantum simulator module To a complete simulation of a specific model”.

The gauge field theory is the foundation of modern physics. For example, quantum electrodynamics and the standard model describing the interaction of elementary particles are all gauge field theories that satisfy the symmetry of a specific group. However, the computational complexity of solving various gauge field equations is so high that it poses a challenge to supercomputers, and quantum computers have high expectations. Thus, a dedicated quantum computer-a quantum simulator came into being. However, in the current international preliminary quantum simulation research on the gauge field model, either the system is too small, with only 2 to 4 particles, and does not have local gauge invariance; or the gauge field and matter field cannot be generated at the same time, more The interaction and transformation between these two fields cannot be studied.