Sci-Tech

Chinese scientists achieve novel quantum states on a hundred bit quantum chip

2025-08-28   

Chinese scientists have achieved a novel quantum state - a new "hot" topological edge state - on a hundred bit superconducting quantum chip, solving the problem of symmetry protected topological edge states being susceptible to thermal noise interference and providing new possibilities for protecting fragile quantum information. This research achievement was jointly completed by Professor Wang Haohua's team from the School of Physics at Zhejiang University, Researcher Guo Qiujiang's team from the Hangzhou International Science and Technology Innovation Center at Zhejiang University, and Associate Professor Deng Dong from the Institute of Interdisciplinary Information at Tsinghua University. It was published in the journal Nature on August 27th. Topological edge state refers to a stable quantum state that is bound to the edge of a quantum system and can resist specific symmetry perturbations. Topological edge states are easily disturbed by thermal noise and usually only exist in ideal environments at absolute zero degrees. In a closed system with multiple particles, the initial state of the system carries a certain amount of local information. Over time, driven by thermal excitation, the initial local information will spread to all particles, like a page of scribbled notes that cannot distinguish the initial handwriting. It is reported that the research is based on the "Tianmu 2" superconducting quantum chip independently developed by Zhejiang University. The chip has 125 superconducting quantum bits and flexible programmability, enabling high-precision synchronous quantum logic operations. Using this chip, the research team explored topological edge states with symmetry protection that are difficult to observe with traditional methods. The research team proposed a theoretical concept of a "preheating" mechanism, attempting to install a "protective shield" on the topological edge states protected by symmetry to suppress their interaction with thermal excitation. After conducting quantum simulation experiments on the "Tianmu 2" superconducting quantum chip, the research team observed the effectiveness of the "preheating" mechanism, which means the birth of a new type of "hot" topological edge state. Researcher Guo Qiujiang stated that the experiment demonstrated that the "preheating" mechanism can effectively resist thermal excitation disturbances and form more robust long-lived topological edge states. This provides a new experimental method for exploring topological states at finite temperatures (i.e. above absolute zero), demonstrating the application value of superconducting quantum chips in simulating novel states, and also providing a new path for constructing noise resistant quantum storage at finite temperatures. (New Society)

Edit:Momo Responsible editor:Chen zhaozhao

Source:Xinhua News Agency

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