Classical-Noise-Free Sensing Based on Quantum Correlation Measurement  

作　　者：Ping Wang Chong Chen Ren-Bao Liu 王评;陈冲;刘仁保(Department of Physics and The Hong Kong Institute of Quantum Information Science and Technology,The Chinese University of Hong Kong,Shatin,New Territories,Hong Kong,China)

机构地区：[1]Department of Physics and The Hong Kong Institute of Quantum Information Science and Technology,The Chinese University of Hong Kong,Shatin,New Territories,Hong Kong,China

出　　处：《Chinese Physics Letters》2021年第1期3-9,共7页中国物理快报（英文版）

基　　金：Supported by Hong Kong RGC/GRF Project(Grant No.14300119).

摘　　要：Quantum sensing,using quantum properties of sensors,can enhance resolution,precision,and sensitivity of imaging,spectroscopy,and detection.An intriguing question is:Can the quantum nature(quantumness)of sensors and targets be exploited to enable schemes that are not possible for classical probes or classical targets?Here we show that measurement of the quantum correlations of a quantum target indeed allows for sensing schemes that have no classical counterparts.As a concrete example,in the case that the second-order classical correlation of a quantum target could be totally concealed by non-stationary classical noise,the higher-order quantum correlations can single out a quantum target from the classical noise background,regardless of the spectrum,statistics,or intensity of the noise.Hence a classical-noise-free sensing scheme is proposed.This finding suggests that the quantumness of sensors and targets is still to be explored to realize the full potential of quantum sensing.New opportunities include sensitivity beyond classical approaches,non-classical correlations as a new approach to quantum many-body physics,loophole-free tests of the quantum foundation,et cetera.

关 键 词：QUANTUM totally STATIONARY 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] O413[自动化与计算机技术—控制科学与工程]