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Quantum-enhanced stochastic phase estimation with the Su(1,1)interferometer

Photonics Research 2020年第10期8卷 1653-1661页

作者： kaimin zheng MINGHAO MI BEN WANG LANG XU LIYUN HU SHENGSHUAI LIU YANBO LOU JETAI JING LIJIAN ZHANG National Laboratory of Solid State Microstructures Key Laboratory of lnteligent Optical Sensing and ManipulationCollege of Engineeringand Applied Sciencesand CollaborativeInnovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210083China Center for Quantum Science and Technology Jiangxi Normal UniversityNanchang 330022China State Key Laboratory of Precision Spectroscopy Joint lnstitute of Advanced Science and Technology School of Physics and Electronic ScienceEast China Normal UniversiryShanghai 200062China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Quantum stochastic phase estimation has many applications in the precise measurement of various physical parameters.Similar to the estimation of a constant phase,there is a standard quantum limit for stochastic phase estimation,which can be obtained with the Mach-Zehnder interferometer and coherent input state.Recently,it has been shown that the stochastic standard quantum limit can be surpassed with nonclassical resources such as squcezed light.However,practical methods to achieve quantum enhancement in the stochastic phase estimation remain largely unexplored.Here we propose a method utilizing the SU(1,1)interferometer and coherent input states to cstimate a stochastic optical phase.As an example,we investigate the Ornstcin-Uhlenback stochastic phase.We analyze the performance of this method for three key estimation problems:prediction,tracking,and smoothing.The results show significant reduction of the mean square error compared with the Mach-Zehnder interferometer under the same photon number flux inside the interferometers.In particular,we show that the method with the SU(1,1)interferometer can achieve fundamental quantum scaling,achieve stochastic Heisenberg scalinga and surpass the precision of the canonical measurement.

关键词： stochastic estimation quantum

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基于YOLOv5s−FSW模型的选煤厂煤矸检测研究

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工矿自动化 2024年第5期50卷 36-43,66页

作者：燕碧娟王凯民郭鹏程郑馨旭董浩刘勇太原科技大学机械工程学院山西太原030024 山西人工智能矿山创新实验室有限公司山西太原030032

针对现有煤矸检测模型存在的特征提取不充分、参数量大、检测精度低且实时性差等问题,提出了一种基于YOLOv5s−FSW模型的选煤厂煤矸检测方法。该模型在YOLOv5s的基础上进行改进,首先将主干网络的C3模块替换为FasterNet Block结构,通过降... 详细信息

针对现有煤矸检测模型存在的特征提取不充分、参数量大、检测精度低且实时性差等问题,提出了一种基于YOLOv5s−FSW模型的选煤厂煤矸检测方法。该模型在YOLOv5s的基础上进行改进,首先将主干网络的C3模块替换为FasterNet Block结构,通过降低模型的参数量和计算量提高检测速度;然后,在颈部网络引入无参型SimAM注意力机制,增强模型对复杂环境下重要目标的关注,进一步提高模型的特征提取能力;最后,在输出端用Wise−IoU替换CIoU边界框损失函数,使模型聚焦普通质量锚框,提高收敛速度和边框的检测精度。消融实验结果表明:与YOLOv5s模型相比,YOLOv5s−FSW模型的平均精度均值(mAP)提高了1.9%,模型权重减少了0.6 MiB,参数量减少了4.7%,检测速度提高了19.3%。对比实验结果表明:YOLOv5s−FSW模型的mAP达95.8%,较YOLOv5s−CBC,YOLOv5s−ASA,YOLOv5s−SDE模型分别提高了1.1%,1.5%和1.2%,较YOLOv5m,YOLOv6s模型分别提高了0.3%,0.6%;检测速度达36.4帧/s,较YOLOv5s−CBC,YOLOv5s−ASA模型分别提高了28.2%和20.5%,较YOLOv5m,YOLOv6s,YOLOv7模型分别提高了16.3%,15.2%,45.0%。热力图可视化实验结果表明:YOLOv5s−FSW模型对煤矸目标特征区域更加敏感且关注度更高。检测实验结果表明:在环境昏暗、图像模糊、目标相互遮挡的复杂场景下,YOLOv5s−FSW模型对煤矸目标检测的置信度得分高于YOLOv5s模型,且有效避免了误检和漏检现象的发生。

关键词：煤矸检测 YOLOv5s FasterNet Block SimAM注意力机制 Wise−IoU边界框损失函数

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Quantum verification of NP problems with single photons and linear optics

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Light(Science & Applications) 2021年第9期10卷 1750-1760页

作者： Aonan Zhang Hao Zhan Junjie Liao kaimin zheng Tao Jiang Minghao Mi Penghui Yao Lijian Zhang National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and Manipulation(Ministry of Education)and College of Engineering and Applied SciencesNanjing University210093NanjingChina Collaborative Innovation Center of Advanced Microstructures Nanjing University210093NanjingChina State Key Laboratory for Novel Software Technology Nanjing University210093NanjingChina

Quantum computing is seeking to realize hardware-optimized algorithms for application-related computational tasks.NP(nondeterministic-polynomial-time)is a complexity class containing many important but intractable problems like the satisfiability of potentially conflict constraints(SAT).According to the well-founded exponential time hypothesis,verifying an SAT instance of size n requires generally the complete solution in an O(n)-bit proof.In contrast,quantum verification algorithms,which encode the solution into quantum bits rather than classical bit strings,can perform the verification task with quadratically reduced information about the solution in O~(Õ−−√n)qubits.Here we realize the quantum verification machine of SAT with single photons and linear optics.By using tunable optical setups,we efficiently verify satisfiable and unsatisfiable SAT instances and achieve a clear completeness-soundness gap even in the presence of experimental imperfections.The protocol requires only unentangled photons,linear operations on multiple modes and at most two-photon joint measurements.These features make the protocol suitable for photonic realization and scalable to large problem sizes with the advances in high-dimensional quantum information manipulation and large scale linear-optical systems.Our results open an essentially new route toward quantum advantages and extend the computational capability of optical quantum computing.

关键词： quantum optics verify

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CFETR先进小样品辐照胶囊优化与热工安全分析

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核动力工程 2024年第2期45卷 139-146页

作者：刘畅刘文斌戴勇孙寿华张平康长虎宋霁阳王凯民彭蕾郑鹏飞中国核动力研究设计院成都610213 瑞士保罗谢尔研究所瑞士5303 Villigen 中国科学技术大学合肥230026 核工业西南物理研究院成都610225

中国聚变工程试验堆(CFETR)先进材料辐照考验样品所在胶囊结构较为复杂,其内部填充氦气,胶囊肋条尺寸、位置以及胶囊内部填充材料对样品温度影响大。基于STAR-CCM+程序建立CFETR先进小样品辐照装置内胶囊全尺寸模型,针对样品的目标温度... 详细信息

中国聚变工程试验堆(CFETR)先进材料辐照考验样品所在胶囊结构较为复杂,其内部填充氦气,胶囊肋条尺寸、位置以及胶囊内部填充材料对样品温度影响大。基于STAR-CCM+程序建立CFETR先进小样品辐照装置内胶囊全尺寸模型,针对样品的目标温度,对胶囊的肋条和填充材料进行了调整。对于胶囊内整体样品释热率较低的情况,采用释热率较大的钨材料作为填充材料,可以明显提高整体样品温度;对于局部样品释热率差别较大的情况,调整局部肋条的尺寸和位置,能够很好控制样品间的温度,使样品计算温度满足目标温度范围。结果表明:采用上述方法进行优化后,样品中心温度能够满足目标温度范围,且满足入高通量工程试验堆(HFETR)辐照的热工安全,保证整个辐照任务能够顺利开展。

关键词： CFETR 胶囊肋条填充物优化 HFETR

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数字式气压计检定箱技术性能测试方法研究

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工业仪表与自动化装置 2024年第1期 61-65,103页

作者：郑树芳刘海珍米凯民杨明华常洁内蒙古自治区气象数据中心内蒙古自治区气象局机关服务中心内蒙古呼和浩市010000

针对目前尚无人对数字式气压计检定箱技术性能的测试方法进行过研究,研究制定出了一套科学合理的数字式气压计检定箱技术性能测试方案,包括对测试所选用测量设备技术指标的要求、测试所需环境条件及传压介质的要求、测试气路连接方式的... 详细信息

针对目前尚无人对数字式气压计检定箱技术性能的测试方法进行过研究,研究制定出了一套科学合理的数字式气压计检定箱技术性能测试方案,包括对测试所选用测量设备技术指标的要求、测试所需环境条件及传压介质的要求、测试气路连接方式的要求、各项技术性能测试方法的设计及测试结果的验证,并以控制范围为(440~1100)hPa的QYJD-10型气压检定箱作为测试对象,以测量范围为(500~1100)hPa的0.01级数字式气压计作为气压标准器、以测量范围为(-60~81)℃和最大允许误差为±0.05℃的数字温度计作为温度标准器,对该测试方案进行了测试验证,综合评价了气压检定箱的各项技术性能均符合被检定或校准仪器相应规程规范的要求,从而证明了该测试方案具有合理性与可行性,为数字式气压计检定箱技术性能的测试工作提供一定的技术指导。

关键词：数字式气压计检定箱传压介质

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间伐保留密度对基于大径材培育下杉木人工林生长和材种结构的影响

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中南林业科技大学学报 2024年第2期44卷 20-28页

作者：王佳琪马东旭蓝伟立陈块明郑鸣鸣叶义全江先桂江祥庆林开敏福建农林大学林学院福建福州350002 国家林业和草原局杉木工程技术研究中心福建福州350002 黔南州林业局贵州都匀558000 福建省官庄国有林场福建三明365000

【目的】探究间伐保留密度对基于大径材培育下杉木人工林的生长、径阶分布和材种结构等方面的影响规律,为杉木大径材定向培育的间伐密度控制技术提供一定的科学理论依据和技术支撑。【方法】以福建省沙县官庄国有林场9年生的杉木人工林... 详细信息

【目的】探究间伐保留密度对基于大径材培育下杉木人工林的生长、径阶分布和材种结构等方面的影响规律,为杉木大径材定向培育的间伐密度控制技术提供一定的科学理论依据和技术支撑。【方法】以福建省沙县官庄国有林场9年生的杉木人工林作为研究对象,设置高间伐保留密度(H:2 250株/hm^(2))、中间伐保留密度(M:1 800株/hm^(2))、低间伐保留密度(L:1 200株/hm^(2))3个处理,进行连续观测5 a。【结果】1)林分胸径随间伐保留密度的减小而增大,表现为L>M>H,且均存在显著性差异(PM>H,林分蓄积量表现为H>M>L;3)总出材量随间伐保留密度的增大而增大,表现为H>M>L;总出材率随间伐保留密度的减小而增大,表现为L>M>H;4)小径材出材量随间伐保留密度的增大而增大,表现为H>M>L,H处理显著大于L处理(P<0.05),出材率表现为随间伐保留密度的减小而增大。中径材出材量随间伐保留密度的减小而增大,与林龄呈正相关,出材率随间伐保留密度的减小而增大。大径材出材量与出材率随间伐保留密度的减小而增大,且L处理显著大于H处理(P<0.05)。【结论】抚育间伐能促进杉木人工林的生长,优化林分结构,有利于大径阶林木培养,这些作用随间伐保留密度的减小而增大。

关键词：杉木间伐保留密度生长林分结构大径材

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一种智能座舱灯光秀的系统设计方案

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汽车电器 2024年第6期 22-23页

作者：江凯敏冯春寿陈文庆徐伟郑淳允侯黎恒广州汽车集团股份有限公司汽车工程研究院广东广州511434

文章主要介绍智能座舱灯光秀的系统架构方案和设计原理,着重介绍信息娱乐系统AVNT、网关控制模块GWM、前照灯控制模块FLCM、后大灯控制模块RLCM、车灯控制模块LCU和集成式车身控制模块IBCM在智能座舱灯光秀的交互控制逻辑。

关键词：智能座舱灯光秀 AVNT GWM IBCM 交互控制逻辑

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Preparation and non-classicality of non-Gaussian quantum states based on catalytic quantum scissors

Preparation and non-classicality of non-Gaussian quantum sta...

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第十八届全国量子光学学术会议

作者：张魁正 Wei Ye kaimin zheng Xuexiang Xu Liyun Hu 江西师范大学 Center for Quantum Science and Technology Jiangxi Normal University Key Laboratory of Optoelectronic and Telecommunication Jiangxi Normal University

The preparation of non-Gaussian quantum states plays an important role in quantum information processing. Based on the quantum shearing device proposed by Pegg et al., this paper implements a non-Gaussian quantum state preparation scheme. When considering the quantum photocatalysis of single-photon input and single-photon detection, the equivalent operator of catalytic quantum scissors can be given in order to understand the physical nature of quantum scissors. When the coherent state is taken as the input state, for an asymmetric beam splitter, the output state can be truncated to zero photon, single photon and two photon components;for a symmetric beam splitter, the output state is only truncated to zero photon and two photon components. The non-classicality of the prepared non-Gaussian quantum states is discussed by the average photon number, signal-to-noise ratio and Wigner function. The results show that the output states present strong non-classicality when the amplitude of the coherent state is large.

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Enhanced photon communication through Bayesian estimation with an SNSPD array

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Photonics Research 2020年第5期8卷 637-641页

作者： XIANG LI JINGROU TAN kaimin zheng LABAO ZHANG LIJIAN ZHANG WEIJI HE PENGWEI HUANG HAOCHEN LI BIAO ZHANG QI CHEN RUI GE SHUYA GUO TAO HUANG XIAOQING JIA QINGYUAN ZHAO XUECOU TU LIN KANG JIAN CHEN PEIHENG WU School of Electronic Science and Engineering Nanjing UniversityNanjing 210023China College of Engineering and Applied Sciences Nanjing UniversityNanjing 210023China Jiangsu Key Laboratory of Spectral Imaging and Intelligence Sense Nanjing University of Science and TechnologyNanjing 210094China

Laser communication using photons should consider not only the transmission environment’s effects,but also the performance of the single-photon detector used and the photon number distribution.Photon communication based on the superconducting nanowire single-photon detector(SNSPD)is a new technology that addresses the current sensitivity limitations at the level of single photons in deep space communication.The communication’s bit error rate(BER)is limited by dark noise in the space environment and the photon number distribution with a traditional single-pixel SNSPD,which is unable to resolve the photon number distribution.In this work,an enhanced photon communication method was proposed based on the photon number resolving function of four-pixel array SNSPDs.A simulated picture transmission was carried out,and the error rate in this counting mode can be reduced by 2 orders of magnitude when compared with classical optical communication.However,in the communication mode using photon-enhanced counting,the four-pixel response amplitude for counting was found to restrain the communication rate,and this counting mode is extremely dependent on the incident light intensity through experiments,which limits the sensitivity and speed of the SNSPD array’s performance advantage.Therefore,a BER theoretical calculation model for laser communication was presented using the Bayesian estimation algorithm in order to analyze the selection of counting methods for information acquisition under different light intensities and to make better use of the SNSPD array’s high sensitivity and speed and thus to obtain a lower BER.The counting method and theoretical model proposed in this work refer to array SNSPDs in the deep space field.

关键词： communication photon estimation

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Chinese herbal medicine combined with cognitive–behavioural therapy for avoidant paruresis:a controlled trial

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General Psychiatry 2023年第5期36卷 402-409页

作者： Shijie Liang Ying Zhou Chao Yu Xiang Gao Fangbin Ji Qianyuan Fang Zhihang Zhang Libin Yang Youkang Zhao Yuhui Zhao Renwu Yin kaimin Chen zheng Lu Urology Longhua Hospital Shanghai University of Traditional Chinese MedicineShanghaiChina Psychology Mental Health Center of HuangpuShanghaiChina The Medical Counseling Department Institute of Huada Applied PsychologyShanghaiChina Psychological Counseling Department Lehu Psychological Consulting CoLTDShanghaiChina Department of Psychiatry Tongji University School of MedicineShanghaiChina Department of Psychiatry Shanghai Mental Health CenterShanghai Jiao Tong University School of MedicineShanghaiChina

Background Avoidant paruresis is a common clinical condition in urology and psychosomatic medicine.However,it has limited treatment options that are safe and effective with few side effects.Aims Our study aimed to investigate the effectiveness and safety of the Chinese herbal Yangxin Tongquan decoction combined with cognitive-behavioural therapy(CBT)for avoidant paruresis.Methods Sixty-eight patients with avoidant paruresis were divided into a treatment group(33 patients)and a control group(35 patients).The control group was assigned 10 weeks of CBT and systematic desensitisation.In addition to CBT and systematic desensitisation,the treatment group was given the Chinese herbal Yangxin Tongquan decoction during the 10-week study.The Shy Bladder Syndrome Scale(SBS)and the Self-rating Anxiety Scale(SAS)were administered before and after treatment to measure any change.Results The overall efficacy in the treatment group(n=30)was 80.0%vs 62.5%in the control group(n=33).Comparing pretreatment and post-treatment measures,both groups showed improvement in SBS scores and SAS scores(treatment group:t_((SBS))=8.397,p_((SBS))<0.001,t_((SAS))=8.216,p_((SAS))<0.001;control group:t_((SBS))=6.802,p_((SBS))<0.001,t_((SAS))=5.171,p_((SAS))<0.001).Moreover,both groups’SBS and SAS scores changed significantly over time(SBS scores:F_(time)=118.299,p<0.001;SAS scores:F_(time)=92.114,p<0.001).However,the treatment group performed better than the control group(SBS scores:F_(time*group)=5.709,p=0.020;SAS scores:F_(time*group)=7.235,p=0.009).Conclusions The Chinese herbal Yangxin Tongquan decoction combined with cognitive-behavioural psychotherapy positively affects the treatment of avoidant paruresis without significant adverse effects.

关键词： herbal decoction behaviour

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