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2022年6月10日朱黄俊研究员线上学术报告
上传时间:2022-06-07 作者: 浏览次数:189

报告题目: Quantum Measurements in the Light of Quantum State Estimation
报告人:  朱黄俊 研究员

报告摘要: Starting from a simple estimation problem, here we propose a general approach for decoding quantum measurements from the perspective of information extraction. By virtue of the estimation fidelity only, we provide surprisingly simple characterizations of rank-1 projective measurements, mutually unbiased measurements, and symmetric informationally complete measurements. Notably, our conclusions do not rely on any assumption on the rank, purity, or the number of measurement outcomes, and we do not need bases to start with. Our work demonstrates that all these elementary quantum measurements are uniquely determined by their information-extraction capabilities, which are not even anticipated before. In addition, we offer a new perspective for understanding noncommutativity and incompatibility from tomographic performances, which also leads to a universal criterion for detecting quantum incompatibility. Furthermore, we show that the estimation fidelity can be used to distinguish inequivalent mutually unbiased bases and symmetric informationally complete measurements. In the course of study, we introduce the concept of (weighted complex projective) $1/2$-designs and show that all $1/2$-designs are tied to symmetric informationally complete measurements, and vice versa (arXiv:2111.02841).

报告人简介: 朱黄俊,先后在浙江大学物理系,北京大学物理学院,和新加坡国立大学量子技术中心获学士,硕士,和博士学位。之后在加拿大圆周理论物理研究所和德国科隆大学理论物理研究所从事博士后研究。2018年1月至今在复旦大学物理学系任研究员。主要研究领域为量子信息基础理论,包括量子测量,量子层析,量子验证,和纠缠理论等。以第一或通讯作者在国际知名期刊发表论文近50篇, 包括PRL 7篇,Nat. Commun. 1篇,和npj Quantum Inf. 3篇。
报告时间:2022年6月10日星期五10:30-11:30
报告地点:腾讯会议ID:955-229-138(密码:0610)
学院联系人 :张林

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