主讲人：王晓光 教授（浙江理工大学）

题目：Incorporating Heisenberg’s Uncertainty Principle into QuantumMultiparameter Estimation

时间：2023年11月10日（周五）下午15：00

地点：理工楼1226

邀请人：安钧鸿

报告摘要：

The quantum multiparameter estimation is very different from the classical multiparameter estimation due to Heisenberg’s uncertainty principle in quantum mechanics. When the optimal measurements for different parameters are incompatible, they cannot be jointly performed. We find a correspondence relationship between the inaccuracy of a measurement for estimating the unknown parameter with the measurement error in the context of measurement uncertainty relations. Taking this correspondence relationship as a bridge, we incorporate Heisenberg’s uncertainty principle into quantum multiparameter estimation by giving a trade-off relation between the measurement inaccuracies for estimating different parameters. For pure quantum states, this trade-off relation is tight, so it can reveal the true quantum limits on individual estimation errors in such cases. We apply our approach to derive the trade-off between attainable errors of estimating the real and imaginary parts of a complex signal encoded in coherent states and obtain the joint measurements attaining the trade-off relation. We also show that our approach can be readily used to derive the trade-off between the errors of jointly estimating the phase shift and phase diffusion without explicitly parametrizing quantum measurements.

个人简介：

王晓光，教授，主要研究方向包括量子信息与计算理论，量子光学，和凝聚态理论。2005年获国务院政府特殊津贴，2006年入选教育部新世纪人才计划，2010年获得国家杰出科学青年基金，主持国家自然科学基金、科技部、教育部等各类科研项目10余项，其中杰出青年科学基金项目1项，国家自然科学基金重点项目1项，自然科学基金重大研究计划子课题1项，主持国家重点研发计划项目子课题2项。在Phys. Rev. Lett., Physics Reports等国际权威期刊发表论文200余篇，总引用8500余次，单篇最高被引500余次。以第一完成人2020年获得高等学校科学研究优秀成果奖（自然科学）二等奖（排名1/7）。全国普通高校力学课程研究会副理事长。