Tsinghua Quantum Information Center discovers the optical suspension nano-diamond twisting mode motion

Yin Yiqi, an assistant researcher at the Quantum Information Center of the Institute of Interdisciplinary Information, Tsinghua University, cooperated with Purdue University in the United States. For the first time in the experiment, he saw the motion of the optical suspension nano-diamond twisting mode, and proposed to use cavity optical mechanics to cool this model. The research paper "Torsional Optomechanics of a Levitated Nonspherical Nanoparticle" was recently published in the "Physical Review Letters", which was selected as an editorial recommendation and was also published by the journal Physics. As a highlight of the same period.

Associate Professor Yin Yiqi from Tsinghua University's Interdisciplinary Information Institute and Professor Li Tongzang from Purdue University of the United States have observed the motion of twisting degrees of freedom in the beam-bound nanodiamond system. The frequency of the twisting mode is higher than that of the same system. Above a magnitude, the attenuation rate is roughly equivalent. They also theoretically studied the efficiency and limits of cooling the twist mode with an optical cavity, and the conditions required to cool to the quantum ground state. This discovery has important value for achieving quantum superposition of macroscopic systems in the future, as well as for measuring small torques caused by individual electrons and even nuclear spins.
The Physical Review Letter is a high-level, authoritative journal of physical synthesis published by the American Physical Society (APS). The first author of the thesis, Thai M. Hoang, is a postdoctoral fellow of Professor Li Tongzang. The second author, Ma Yue, is a senior undergraduate student in the Department of Physics at Tsinghua University. She participated in the theoretical analysis of the experiment under the guidance of Dr. Yin Qiqi. . Professor Li Tongzang and Yin Yiqi, assistant researcher, are co-authors of the paper. The study was funded by the National Natural Science Foundation of China.