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Deterministic all-optical quantum state sharing

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Advanced Photonics 2023年第2期5卷 80-86页

作者： Yingxuan Chen Qiqi Zhu Xutong Wang Yanbo Lou Shengshuai Liu jietai jing East China Normal University State Key Laboratory of Precision SpectroscopyJoint Institute of Advanced Science and TechnologySchool of Physics and Electronic ScienceShanghaiChina CAS Center for Excellence in Ultra-intense Laser Science ShanghaiChina Shanxi University Collaborative Innovation Center of Extreme OpticsTaiyuanChina

Quantum state sharing,an important protocol in quantum information,can enable secure state distribution and reconstruction when part of the information is lost.In(k,n)threshold quantum state sharing,the secret state is encoded into n shares and then distributed to n players.The secret state can be reconstructed by any k players(k>n∕2),while the rest of the players get nothing.In the continuous variable regime,the implementation of quantum state sharing needs the feedforward technique,which involves opticelectro and electro-optic conversions.These conversions limit the bandwidth of the quantum state sharing.Here,to avoid the optic-electro and electro-optic conversions,we experimentally demonstrate(2,3)threshold deterministic all-optical quantum state sharing.A low-noise phase-insensitive amplifier based on the four-wave mixing process is utilized to replace the feedforward technique.We experimentally demonstrate that any two of three players can cooperate to implement the reconstruction of the secret state,while the rest of the players cannot get any information.Our results provide an all-optical platform to implement arbitrary(k,n)threshold deterministic all-optical quantum state sharing and pave the way to construct the all-optical broadband quantum network.

关键词： quantum information quantum state sharing four-wave mixing.

Optical quantum states based on hot atomic ensembles and their applications

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Photonics Insights 2022年第2期1卷 57-98页

作者： Kai Zhang Shengshuai Liu Yingxuan Chen Xutong Wang jietai jing State Key Laboratory of Precision Spectroscopy Joint Institute of Advanced Science and TechnologySchool of Physics and Electronic ScienceEast China Normal UniversityShanghaiChina CAS Center for Excellence in Ultra-intense Laser Science ShanghaiChina Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanChina

The four-wave mixing process in atomic ensembles has many important applications in quantum information.We review recent progress on the generation of optical quantum states from the four-wave mixing process in hot atomic ensembles,including the production of two-beam,multi-beam,and multiplexed quantum correlated or entangled states.We also review the applications of these optical quantum states in implementing quantum information protocols,constructing SU(1,1)quantum interferometers,and realizing quantum plasmonic sensing.These applications indicate that the four-wave mixing process in hot atomic ensembles is a promising platform for quantum information processing,especially for implementing alloptical quantum information protocols,constructing SU(1,1)interferometers,and realizing quantum sensing.

关键词： optical quantum states four-wave mixing atomic ensemble quantum information protocol

Influence of aerosol on regional precipitation in North China

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Chinese Science Bulletin 2009年第3期54卷 474-483页

作者： DUAN jing MAO jietai Department of Atmospheric Sciences School of Physics Peking University Beijing 100871 China Chinese Academy of Meteorological Sciences Beijing 100081 China

The possible anthropogenic aerosol effect on regional precipitation is analyzed based on the historical data of precipitation and visibility of North China. At first, the precipitation amounts from 1960 to 1979 are considered as natural background values in our study for relatively less intensive industrial activi- ties and light air pollution during that period of time, then the region is divided into different subregions by applying the clustering method including the significance test of station rainfall correlations to the time series of 10-day mean rainfall amounts in this period. Based on the rule that the precipitation characteristics are similar in the same clustering region, the correlation of precipitation amounts among all stations in each region is thus established. Secondly, for the period from 1990 to 2005, during which, the economy had experienced a rapid development in this region, the variations of visibility at each station are analyzed. The stations with the absolute change in visibility less than 0.1 km/a are used as the reference stations, at which it is assumed that precipitation has not been seriously influ- enced by anthropogenic aerosols. Then the rainfall amounts of reference stations are used to estimate the natural precipitation values of the other stations in each clustering region. The difference between estimated precipitation and measured precipitation amount is thought to result from changes in an- thropogenic aerosols. These changes in precipitation amounts caused by anthropogenic aerosols at each station are calculated using the 10-day mean rainfall values from 1990 to 2005. The analysis re- sults obtained with this method are remarkable if it passes the significance test, and therefore, the suppression of regional precipitation over the region by anthropogenic aerosol is proved. It is found that this effect is most remarkable in summer. The influence of anthropogenic aerosols on convective precipitation possibly plays an important role in this season.

关键词：气溶胶区域降水规律聚类法变更趋势分析回归分析

Quantum optical devices based on four-wave mixing in hot rubidium vapor

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Science China(Physics,Mechanics & Astronomy) 2015年第6期58卷 47-54页

作者： FANG YaMi QIN ZhongZhong WANG HaiLong CAO LeiMing XIN Jun FENG jingLiang ZHANG WeiPing jing jietai State Key Laboratory of Precision Spectroscopy Quantum Institute for Light and AtomsDepartment of PhysicsEast China Normal University

In this paper,we briefly review the recent experimental progresses in quantum optics based on four-wave mixing(FWM) processes in hot rubidium vapor,particularly our two recent experiments in quantum information.We have experimentally produced strong quantum correlations between three bright beams generated by two cascaded FWM processes.The intensity difference squeezing with the cascaded system is enhanced to(-7.0±0.1)d B from the(-5.5±0.1)d B/(4.5±0.1)d B with only one FWM process.Also,this system can be easily extended to multiple modes using multiple FWM processes.Besides,we have also successfully realized a cascade all-optical transistor(AOT),which is driven by a very weak light beam about 800 photons in total.The required probe power for achieving a switching efficiency of 50% can be as low as 180 p W,and it can manipulate a light beam with power of 5.0×106 times more,which proves the cascade of the AOT.Both experiments may find wide applications in quantum information and optical communication.

关键词：四波混频量子光学光学器件蒸汽级联系统实验进展铷量子信息

Squeezing bandwidth controllable twin beam light and phase sensitive nonlinear interferometer based on atomic ensembles

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Chinese Science Bulletin 2012年第16期57卷 1925-1930页

作者： jing jietai LIU CunJin ZHOU ZhiFan HUDELIST Florian YUAN ChunHua CHEN LiQing LI XiaoYun QIAN jing ZHANG KeYe ZHOU Lu MA HongMei DONG GuangJiong OU ZeYu ZHANG WeiPing Quantum Institute for Light and Atoms Department of PhysicsEast China Normal UniversityShanghai 200062China State Key Laboratory ofPrecision Spectroscopy East China Normal UniversityShanghai 200062China Department of Physics Indiana University-Purdue University IndianapolisIndianapolisIndiana 46202USA

We review our recent experimental progress in quantum technology employing amplification effect of four-wave mixing in a rubidium vapor. We have produced an intensity difference squeezed light source at frequencies as low as 1.5 kHz which is so far the lowest frequency at which squeezing has been observed in an atomic system. Moreover, we find that the bandwidth of our squeezed light source can be controlled with light intensity pumping. Using our non-classical light source, we have further developed a nonlinear Mach-Zehnder (MZ) interferometer, for which the maximum fringe intensity depends quadratically on the intensity of the phase-sensing field at the high-gain regime, leading to much better sensitivity than a linear MZ interferometer in which the beam splitters have the same phase-sensing intensity. The quantum technologies developed by our group could have great potential in areas such as precision measurement and quantum information.

关键词：原子系统干涉仪非线性相位带宽挤压双光束强度差压缩

Low-Noise Intensity Amplification of a Bright Entangled Beam

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Chinese Physics Letters 2021年第9期38卷 6-10页

作者：娄彦博徐笑吟刘胜帅荆杰泰 State Key Laboratory of Precision Spectroscopy Joint Institute of Advanced Science and TechnologySchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200062China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800China Department of Physics Zhejiang UniversityHangzhou 310027China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

We experimentally demonstrate a low-noise phase-sensitive amplifier(PSA)scheme that is able to amplify bright entangled beams at a high level intensity gain of up to 4.4.Moreover,we demonstrate that the PSA scheme introduces much less uncorrelated extra noise to the entangled state than the phase-insensitive amplifier scheme with the same intensity gain.This PSA scheme has potential applications for quantum communication in continuous variable regimes.

关键词： scheme quantum phase

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基于原子系综四波混频过程的量子信息协议

光学学报 2022年第3期42卷 38-53页

作者：荆杰泰张凯刘胜帅华东师范大学精密光谱科学与技术国家重点实验室上海200062 中国科学院超强激光科学卓越创新中心上海201800 山西大学极端光学协同创新中心山西太原030006

与经典体系相比,量子信息协议在大幅提高信息处理的安全性、保真度和容量方面具有巨大的优势。各种具有不同功能的量子信息协议已经被提出并实现。介绍了利用铷原子四波混频过程构建一套能兼容多种不同量子信息协议的多功能平台。基于... 详细信息

与经典体系相比,量子信息协议在大幅提高信息处理的安全性、保真度和容量方面具有巨大的优势。各种具有不同功能的量子信息协议已经被提出并实现。介绍了利用铷原子四波混频过程构建一套能兼容多种不同量子信息协议的多功能平台。基于这个平台可以实现并行9通道全光量子隐形传态,部分无实体量子态传输和最优N→M相干态量子克隆协议。更重要的是,部分无实体量子态传输协议可以同时连接全光量子隐形传态协议和最优1→M相干态量子克隆协议。这些量子信息协议在全光量子通信中具有潜在的应用。

关键词：量子光学四波混频全光量子隐形传态部分无实体量子态传输量子克隆

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气溶胶与云相互作用的研究进展

地球科学进展 2008年第3期23卷 252-261页

作者：段婧毛节泰北京大学物理学院大气科学系北京100871

气溶胶和云在气候系统中扮演着重要角色,近年来随着人们对它们重要作用的深入认识,气溶胶与云的相互作用也逐渐成为气候研究的一个重要方向。对该领域的研究方法和近20年来国内外的相关研究做了全面回顾。飞机观测、卫星观测、以及观测... 详细信息

气溶胶和云在气候系统中扮演着重要角色,近年来随着人们对它们重要作用的深入认识,气溶胶与云的相互作用也逐渐成为气候研究的一个重要方向。对该领域的研究方法和近20年来国内外的相关研究做了全面回顾。飞机观测、卫星观测、以及观测和模式模拟相结合3种研究方法被主要应用于该项研究。大量观测和模拟都证明了气溶胶对辐射、云滴以及降水的影响;云凝结核作为气溶胶和云相互作用过程中的重要环节,近些年在观测技术上有了较大进展,对相关理论的研究也随着观测水平的进步有了较大发展。我国在该领域的研究也从单一的观测资料分析逐渐转向模式模拟、多种方法综合分析。最后结合国内外研究进展,对该领域未来的发展进行了展望。

关键词：气溶胶云相互作用气溶胶间接效应云凝结核

长江三角洲大气气溶胶光学厚度分布和变化趋势研究

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环境科学学报 2007年第4期27卷 537-543页

作者：段婧毛节泰北京大学物理学院大气科学系北京100871

利用2000-2005年MODIS Level2气溶胶产品分析了长江三角洲区域气溶胶光学厚度的分布和季节变化特点．结果显示，近年来长江三角洲气溶胶光学厚度值较高的区域逐年增加，光学厚度大于1．0的区域面积增加最快．根据城市气溶胶季节变化特... 详细信息

利用2000-2005年MODIS Level2气溶胶产品分析了长江三角洲区域气溶胶光学厚度的分布和季节变化特点．结果显示，近年来长江三角洲气溶胶光学厚度值较高的区域逐年增加，光学厚度大于1．0的区域面积增加最快．根据城市气溶胶季节变化特征研究，发现长江三角洲地区各主要城市近年气溶胶有逐渐增加的趋势．统计结果表明，平原城市群气溶胶年峰值出现在夏季；山区城市群气溶胶年峰值出现在春季．平原城市群光学厚度增加速度大于山区城市群。

关键词： MODIS 气溶胶光学厚度长江三角洲