学术沙龙（9月12日 15:00-16:30）

主讲题目：量子精密测量简介与反馈哈密顿量控制的应用

Title: Introduction to quantum metrology and the application of feedback Hamiltonian control

主持人：项泽亮教授

Host: Prof. Ze-Liang Xiang

时间地点：9月12日15：00-16：30，十友堂300

Time: 15:00-16:30, Sep. 12

Location: Rm 300, Shi You Tang

报告简介：量子精密测量是近年快速发展的一种量子增强技术，它主要利用量子关联来提高量子测量的精度。在此报告中，我们将介绍量子精密测量的背景知识和基本原理，并着重讨论如何通过哈密顿量控制提高量子测量的精度。我们将展示通过施加合适的哈密顿量控制，传统磁场频率的测量精度可以被大幅提高并突破经典极限。这种哈密顿量控制是基于反馈的，并且通过少数几轮的反馈即可趋向最优。在报告的最后，我们将对当前量子精密测量领域的一些活跃方向进行展望。

Abstract: Quantum metrology is a rapid-developing quantum technology in recent years, which uses quantum correlation to enhance the sensitivity of quantum measurements. In this presentation, we will introduce the basic principle of quantum metrology, and discuss how to improve the precision of quantum measurements by Hamiltonian control. We show that by proper Hamiltonian control, the precision of traditional frequency measurement of a magnetic field can be significantly increased and break the classical limit. This Hamiltonian control is feedback-based, and can approach to be optimal by very few rounds of feedbacks. At the end of the talk, we outline current active research directions in the field of quantum metrology.

报告人简介：庞盛世，中山大学物理学院教授。2012年博士毕业于中国科学技术大学，2013年至2019年先后在美国南加州大学、罗切斯特大学和费米国家实验室从事博士后研究，主要研究方向为量子信息和量子精密测量。目前在Nature Communications、Physical Review Letters、Physical Review A等国际物理学期刊上发表SCI论文18篇。

Profile: Shengshi Pang, professor of School of Physics at Sun Yat-Sen University. He received the PhD degree from University of Science and Technology of China in 2012, and did postdoc research at University of Southern California, University of Rochester and Fermilab from 2013 to 2019. His main research interest is quantum information and quantum metrology. Shengshi Pang has so far published 18 papers in Nature Communications, Physical Review Letters, Physical Review A, etc.