Academician Sun Changpu Sheds Light on 2022 Nobel Prize in Physics at the Distinguished Colloquium of School of Physics, Peking University

On November 11th, 2022, a special session of the Distinguished Colloquium of the School of Physics, Peking University for Nobel Prize elucidation took place in the Siyuan Multipurpose Hall of Physics West Building. Upon invitation, Sun Changpu, Dean of the Graduate School of China Academy of Engineering Physics and visiting professor of Peking University, expounded on the 2022 Nobel Prize in Physics by delivering a report entitled “Violation of Bell's Inequality and Its Experimental Verification”. Gao Yuanning, Dean of the School of Physics, chaired the colloquium.

Professor C. P. Sun first briefly introduced the concept of entangled states in quantum mechanics and the birth of Bell's inequality. He then introduced the experiments on the violation of Bell's inequality conducted by 2022 Nobel laureates in Physics A. Aspect, J. F. Clauser, and A. Zeilinger. He also highlighted the fundamental contributions of Chinese physicists Chien-Shiung Wu, T. D. Lee, C. N. Yang, Yanhua Shih, and Chuang-Tian Chen to the research of entangled states and Bell's inequality. Finally, the Einstein-Podolsky-Rosen paradox and the interpretation of quantum mechanics were discussed, and it was pointed out that the "wave-packet collapse hypothesis" of the Copenhagen interpretation leads to a superluminal "action at a distance". This hypothesis also leads to questions about the completeness of quantum mechanics in the EPR paper.

After the report, the teachers and students raised some questions about the experimental realization of coincidence measurement and the concept of a single photo, and Professor C. P. Sun explored these complicated subjects in an approachable way.

More than 40 teachers and students attended on site and the colloquium was broadcast live via Peking University’s official account on Wechat Channel, Bilibili, TikTok, Kuaishou and KouShare.