Achieving 1.2 fm/Hz^(1/2)Displacement Sensitivity with Laser Interferometry in Two-Dimensional Nanomechanical Resonators:Pathways towards Quantum-Noise-Limited Measurement at Room Temperature  

作　　者：Jiankai Zhu Luming Wang Jiaqi Wu Yachun Liang Fei Xiao Bo Xu Zejuan Zhang Xiulian Fan Yu Zhou Juan Xia Zenghui Wang 

机构地区：[1]Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu 610054,China [2]School of Physics and Electronics,Hunan Key Laboratory of Nanophotonics and Devices,Central South University,Changsha 410083,China [3]State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China

出　　处：《Chinese Physics Letters》2023年第3期74-81,共8页中国物理快报（英文版）

基　　金：the National Key R&D Program of China(Grant No.2022YFB3203600);the National Natural Science Foundation of China(Grant Nos.62150052,62250073,U21A20459,62004026,61774029,62104029,and 12104086);the Sichuan Science and Technology Program(Grant No.2021YJ0517 and 2021JDTD0028);the Natural Science Foundation of Hunan Province(Grant No.2021JJ40780);the Science and Technology Innovation Program of Hunan Province“Hu Xiang Young Talents”(Grant No.2021RC3021)。

摘　　要：Laser interferometry is an important technique for ultrasensitive detection of motion and displacement.We push the limit of laser interferometry through noise optimization and device engineering.The contribution of noises other than shot noise is reduced from 92.6%to 62.4%,demonstrating the possibility towards shotnoise-limited measurement.Using noise thermometry,we quantify the laser heating effect and determine the range of laser power values for room-temperature measurements.With detailed analysis and optimization of signal transduction,we achieve 1.2 fm/Hz^(1/2)displacement measurement sensitivity at room temperature in twodimensional(2D)Ca Nb_(2)O_(6)nanomechanical resonators,the best value reported to date among all resonators based on 2D materials.Our work demonstrates a possible pathway towards quantum-noise-limited measurement at room temperature.

关 键 词：noise interferometry optimization 

分 类 号：TN247[电子电信—物理电子学]