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Manipulating a micro-cantilever between its optomechanical bistable states in a lever-based Fabry-Pérot cavity

Science China(Physics,Mechanics & Astronomy) 2015年第5期58卷 41-45页

作者： FU Hao ding jiangfang LI Yong CAO GengYu State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of Sciences University of Chinese Academy of Sciences Beijing Computational Science Research Center

In this paper, we demonstrate experimentally switching a cantilever between its optomechanical bistable states in a low finesse optical cavity. Our experiment shows that the deformation of cantilever can be manipulated by tuning the cavity resonance. When the laser power increases across the threshold value of 110 ?W, optomechanical bistability is induced by strong static photothermal backaction at room temperature. Numerical calculation revealed that the bistable effect originates from the multi-well potential created via the optomechanical interaction. Switching of the cantilever between the bistable states was achieved by tuning the cavity to the corresponding boundaries of the bistable region, where the barrier between the bistable states vanishes.

关键词： optomechanical bistability static deformation control optomechanical switch photothermal backaction micro-cantilever

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Boosting the dimensionality of frequency entanglement using a reconfigurable microring resonator

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Science China(Physics,Mechanics & Astronomy) 2023年第5期66卷 79-88页

作者： Chao Wu Qilin Zheng Yingwen Liu Yang Wang jiangfang ding Pingyu Zhu Shichuan Xue Miaomiao Yu Weihong Luo Kaikai Zhang Anqi Huang Mingtang Deng Junjie Wu Ping Xu Institute for Quantum Information State Key Laboratory of High Performance ComputingCollege of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China National Laboratory of Solid State Microstructures School of PhysicsNanjing UniversityNanjing 210093China

Integrated quantum frequency combs(QFCs)based on microring resonators supplies as an essential resource for expanding the Hilbert-space dimensionality for high-dimensional quantum computing and information *** this work,we propose and demonstrate a reconfigurable ring resonator with tunable quality factors to efficiently increase the dimensionality of frequency entanglement,simultaneously,ensuring a high on-chip pair generation rate(PGR)and coincidence-to-accidental ratio(CAR).Our method exploits the asymmetric Mach-Zehnder interferometer instead of the traditional straight waveguide as the coupler of resonators which offer a tunable external coupling coefficient to modulate the quality factor to enlarge the QFCs’bandwidth and thus increase the dimensionality of frequency *** measured the QFCs’joint spectral intensity of 28 frequency pairs under various quality factors ranging from 16.6×10^(4) to 3.4×10^(4).Meanwhile,the measured Schmidt number increased from 11.01 to 24.77,denoting a huge expansion of the Hilbert-space dimensionality from 121 to a record number of 613 dimensions,which agrees well with our theoretical *** addition,the PGR and CAR-another two key parameters for high-quality QFCs-were all measured under different quality factors to verify that our method can significantly increase the Schmidt number and CAR while maintaining a high *** fact,bright QFCs with a total PGR of 4.3 MHz under a 0.48 mW pump power and a mean CAR of 1578 were simultaneously obtained at the highest Schmidt *** method is widely applicable to other material-based ring resonators and can act as a general solution for high-dimensional QFCs.

关键词： reconfigurable resonator quantum frequency comb Hilbert-space dimensionality

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关于海绵城市建筑工程技术应用

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陶瓷 2020年第10期 100-101页

作者：丁江芳山西八建集团有限公司太原030027

我国部分城市存在内涝或者热岛效应的问题,严重影响到城市的可持续发展,对于城市居民的生活质量也带来了一定程度的负面影响,也是生态文明城市建设中需要关注的重要节点。由此就需要高度重视海绵城市建筑工程技术的运用,这样可以使得城... 详细信息

我国部分城市存在内涝或者热岛效应的问题,严重影响到城市的可持续发展,对于城市居民的生活质量也带来了一定程度的负面影响,也是生态文明城市建设中需要关注的重要节点。由此就需要高度重视海绵城市建筑工程技术的运用,这样可以使得城市可持续发展中的诸多问题得到很好的解决。本文从这个角度入手,首先对于海绵城市的效能进行归结,接着归结海绵城市建筑工程技术,也提出了对应的意见和建议。

关键词：海绵城市建筑工程技术应用

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