Realization of quantum ground state in an optomechanical crystal cavity  

作　　者：Yu Wang Zhi-Peng Shi Hong-Yi Kuang Xiang Xi Shuai Wan Zhen Shen Pi-Yu Wang Guan-Ting Xu Xiankai Sun Chang-Ling Zou Guang-Can Guo Chun-Hua Dong 

机构地区：[1]CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China [2]CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230088,China [3]Department of Electronic Engineering,The Chinese University of Hong Kong,Hong Kong,China [4]Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第12期110-118,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0303203);the National Natural Science Foundation of China(Grant Nos.12293052,12293050,11934012,92050109,12104442,12061131011,92265210,and 92250302);the CAS Project for Young Scientists in Basic Research(Grant No.YSBR-069);the Fundamental Research Funds for the Central Universities;USTC Research Funds of the Double First-Class Initiative。

摘　　要：Ground-state cooling of the mechanical degree of freedom is a fundamental requirement for quantum state transfer between relevant optical and mechanical systems.Here,we fabricate optomechanical crystal cavities with co-localized mechanical and optical modes on a monolithic chip.The typical linewidth of the optical modes at telecom wavelength is as low as 0.95 GHz,and the mechanical resonant frequency is around 5 GHz,which means the optomechanical system can be operated in the resolved sideband regime.With the statistics of the asymmetry in the scattering rates of red and blue detuning driving processes,we initialize and characterize the mechanical system in its quantum ground-state of motion,with a mean thermal phonon occupancy nth=0.018±0.0034,corresponding to a mode temperature of 57.3 m K.It is a general platform for quantum state transfer between relevant optical and mechanical systems,as well as the quantum entanglement between these systems.

关 键 词：MICROCAVITY cavity optomechanics optomechanical crystal cavity quantum ground state 

分 类 号：O431.2[机械工程—光学工程]