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国家重点基础研究发展计划(2013CB328700)

作品数:6 被引量:33H指数:2
相关作者:龚旗煌古英王珞珈赵东星任娟娟更多>>
相关机构:北京大学山西大学更多>>
发文基金:国家重点基础研究发展计划国家自然科学基金更多>>
相关领域:理学机械工程电子电信生物学更多>>

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Ultrafast solvation dynamics at internal sites of staphylococcal nuclease investigated by site-directed mutagenesis
2015年
Internal solvation of protein was studied by site-directed mutagenesis, with which an intrinsically fluorescent probe,tryptophan, is inserted into the desired position inside a protein molecule for ultrafast spectroscopic study. Here we review this unique method for protein dynamics research. We first introduce the frontiers of protein solvation, site-directed mutagenesis, protein stability and characteristics, and the spectroscopic methods. Then we present time-resolved spectroscopic dynamics of solvation dynamics inside cavities of active sites. The studies are carried out on a globular protein, staphylococcal nuclease. The solvation at sites inside the protein molecule's cavities clearly reveals characteristics of the local environment. These solvation behaviors are directly correlated to enzyme activity.
高光宇李渝王伟王树峰Dongping Zhong龚旗煌
基于表面等离激元的量子相干效应的理论研究被引量:3
2013年
起源于金属中自由电子集体振荡的表面等离激元,具有超小的光学模式体积和亚波长局域的近场增益,为纳米尺度上研究光和物质相互作用带来新的机遇.共振的纳米金属结构的近场区域,具有各向异性的珀塞尔系数,并且可以为量子体系提供近场激发.我们理论上演示了基于表面等离激元结构的单分子共振荧光、原子布居数的本征量子拍频及其在表面等离激元结构中的纳米尺度上的实现、表面等离激元诱导的各向异性珀塞尔系数导致的亚波长尺度自发辐射谱线的变化.这些结果在超紧凑的有源量子器件中有潜在应用.
古英王珞珈龚旗煌
关键词:表面等离激元量子相干量子拍频共振荧光
Blue-detuned optical atom trapping in a compact plasmonic structure被引量:2
2017年
We theoretically propose blue-detuned optical trapping for neutral atoms via strong near-field interfacing in a plasmonic nanohole array. The optical field at resonance forms a nanoscale-trap potential with an FWHM of 200 nm and about ~370 nm away from the nanohole; thus, a stable 3 D atom trapping independent of the surface potential is demonstrated. The effective trap depth is more than 1 m K when the optical power of trapping light is only about 0.5 m W, while the atom scattering rate is merely about 3.31 s^(-1), and the trap lifetime is about 800 s.This compact plasmonic structure provides high uniformity of trap depths and a two-layer array of atom nanotraps, which should have important applications in the manipulation of cold atoms and collective resonance fluorescence.
ZHAO CHENFAN ZHANGQI ZHANGJUANJUAN RENHE HAOXUEKE DUANPENGFEI ZHANGTIANCAI ZHANGYING GUQIHUANG GONG
Experimental long-distance quantum secure direct communication被引量:27
2017年
Quantum secure direct communication(QSDC) is an important quantum communication branch, which realizes the secure information transmission directly without encryption and decryption processes.Recently, two table-top experiments have demonstrated the principle of QSDC. Here, we report the first long-distance QSDC experiment, including the security test, information encoding, fiber transmission and decoding. After the fiber transmission of 0.5 km, quantum state fidelities of the two polarization entangled Bell states are 91% and 88%, respectively, which are used for information coding. We theoretically analyze the performance of the QSDC system based on current optical communication technologies,showing that QSDC over fiber links of several tens kilometers could be expected. It demonstrates the potential of long-distance QSDC and supports its future applications on quantum communication networks.
Feng ZhuWei ZhangYubo ShengYidong Huang
局域表面等离激元-量子复合体系中量子干涉的理论研究被引量:2
2017年
局域表面等离激元与量子发射体构成的复合体系具有比其单个子单元更丰富的性质和功能.本文从理论上研究了量子干涉效应对复合体系吸收和散射性质的影响以及对原子体系非线性效应的调控.首先,由于存在不同跃迁通道之间的干涉,体系支持暗表面等离激元诱导的无布居数反转增益和光强依赖的吸收谱效应.其次,结构开放性诱导的干涉使复合体系能够在纳米尺度、中等强度耦合下调控散射场的光子统计性质.最后,基于表面等离激元的各向异性珀塞尔系数,在纳米尺度演示了对于克尔非线性的调控.这些发现丰富了该复合体系的吸收和散射性质以及原子体系的非线性性质,并且有可能用于量子态制备、带通滤波器、折射率传感、光子统计调控、片上的全光非线性器件等方面.
赵东星陈弘毅古英任娟娟龚旗煌
关键词:量子干涉腔量子电动力学
Experimental simulation of violation of the Wright inequality by coherent light
2017年
In this paper, we investigate the simulation of violation of the Wright inequality by the classical optical experiment theoretically and experimentally. The feasibility of the simulation is demonstrated by theoretical analysis based on descriptions of the classical electrodynamics and quantum mechanics, respectively. Then, the simulation of violation of the Wright inequality is realized experimentally. The setup is based on a laser source, free-space optical devices and power meters. The experimental result violates the noncontextuality hidden variable bound, agreeing with the quantum bound. This method can be extended to other types of noncontextuality inequalities.
朱锋张巍黄翊东
关键词:POLARIZATION
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