報(bào)告人：王曉光

主持人：嚴(yán) 冬

時(shí)  間：2021年6月22日上午9：30

地  點(diǎn)：綜合樓B區(qū)1306

主辦單位：長(zhǎng)春大學(xué)理學(xué)院

報(bào)告人簡(jiǎn)介：王曉光，浙江大學(xué)教授，長(zhǎng)期從事量子信息論和量子物理基礎(chǔ)問題的研究，同時(shí)在量子光學(xué)和凝聚態(tài)理論中也進(jìn)行了一系列的工作，在國(guó)內(nèi)外學(xué)術(shù)刊物上共發(fā)表SCI收錄論文150篇，論文共被SCI他引5000余次。2001年發(fā)表在《物理評(píng)論A》上關(guān)于磁性系統(tǒng)海森堡XY模型中量子糾纏態(tài)的研究被SCI單篇引用600次，受到量子信息和凝聚態(tài)兩個(gè)領(lǐng)域研究人員高度重視，SCI引用次數(shù)超過100次的論文共有14篇。2011年P(guān)hysics Reports上發(fā)表綜述性論文，量子自旋壓縮，系統(tǒng)評(píng)述了這個(gè)方向的最新進(jìn)展（被引用300次）。2010年獲得國(guó)家基金委杰出青年科學(xué)基金資助，國(guó)務(wù)院特殊津貼獲得者。

觀點(diǎn)綜述：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.