讲座题目🛅:Further investigation on quantum measurement using a trapped ion system 主讲人⚧:陈平形 教授 主持人:董光炯 教授 开始时间:2020-10-15 10:00 讲座地址➝:闵行校区光学大楼A508 主办单位:精密光谱科学与技术国家重点实验室
报告人简介👳🏼♂️: 陈平形👭🏼🏹,男,湖南湘乡人。1996年从华东师大获得理论物理专业硕士学位后分配到国防科学技术大学工作。1998年开始量子信息基础理论研究,2003年在国防科大获得博士学位。2004-2006年在中国科技大学中国科学院量子信息重点实验室从事博士后研究,2006和2007年先后二次在香港浸会大学作访问研究,2010年在牛津大学物理系作访问学者。2006年开始负责筹建多光子干涉及其应用实验平台,2009年开始负责囚禁离子量子计算实验室建设。团队成员2013年成功囚禁离子并实现60多个离子的离子晶体,2015年实现芯片离子阱中离子的囚禁👨🏻💻,2016年实现芯片离子的等间距排列与芯片上离子的输运🗺。在包括Nature Physics🧑🏿💻💦、Physical Review Letters 🕵🏿♀️、Optica🏤、Physical Review A 等国际重要学术刊物上发表SCI学术论文80余篇,论文他引1000余次👨👧👦🚦。出版相关学术著作3部。以第一完成人获湖南省自然科学一等奖1项🥷🏼。现为中国物理学会量子光学专业委员会委员🤶,《量子光学学报》编委,国防科技大学教授🧢、博士生导师👳🏼、量子信息方向学科带头人。 报告内容: Quantum measurement has been an important and vague topic in quantum mechanics. Two complementary measurement schemes have been widely investigated in a variety of quantum systems, i.e. von Neumann's projective (strong) measurement (1932) and Aharonov's weak measurement (1988). Recent some experiments showed the weak measurement with photons. Here, we present the first proof-of-principle experimental demonstration of purely atomic WVA using a single trapped 40Ca+ ion. And then we report the observation of measurement transition from weak to strong in a single trapped 40+ 27 ion system. The transition is realized by tuning the interaction strength between the ion's internal electronic state and its vibrational motion, which play the roles of the measured system and the measuring apparatus, respectively. More precisely, the weak-to-strong measurement transition is characterized by a universal transition factor. This transition, which continuously connects weak measurement and strong measurement, is capable of opening new experimental possibilities for testing quantum foundations. It also prompts us to reexamine and improve the measurement schemes of related quantum technologies. |