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Extension of Linear Response Regime in Weak-Value Amplification Technique
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作者 张满超 张杰 +5 位作者 苏闻博 杨雪滢 吴春旺 谢艺 吴伟 陈平形 《Chinese Physics Letters》 SCIE EI CAS CSCD 2023年第4期1-5,共5页
The achievable precision of parameter estimation plays a significant role in evaluating a strategy of metrology.In practice,one may employ approximations in a theoretical model development for simplicity,which,however... The achievable precision of parameter estimation plays a significant role in evaluating a strategy of metrology.In practice,one may employ approximations in a theoretical model development for simplicity,which,however,will cause systematic error and lead to a loss of precision.We derive the error of maximum likelihood estimation in the weak-value amplification technique where the linear approximation of the coupling parameter is used.We show that this error is positively related to the coupling strength and can be effectively suppressed by improving the Fisher information.Considering the roles played by weak values and initial meter states in the weak-value amplification,we also point out that the estimation error can be decreased by several orders of magnitude by averaging the estimations resulted from different initial meter states or weak values.These results are finally illustrated in a numerical example where an extended linear response regime to the parameter is observed. 展开更多
关键词 estimation ERROR PARAMETER
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Study on Factors of College Student's Network service time Based on Bayesian Networks
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作者 chunwang wu 《International Journal of Technology Management》 2013年第1期118-120,共3页
Due to the uncertainty of the factors that influence the network service time and other characters of college student, Bayesian Network is used to model this kind of system. Different algorithms are used for learning ... Due to the uncertainty of the factors that influence the network service time and other characters of college student, Bayesian Network is used to model this kind of system. Different algorithms are used for learning Bayesian Networks in order to compare several models. It is suggested that researchers can use Bayesian Networks to explore the potential relationship between variables of complex social problems. The result indicates that learning target and family closeness degree are the key variables which influenced college student' s network service time. Origin of student and family economy didn' t influence college student' s network service time directly. Schools and community should strengthen the education of college students life planning and communication with parents. 展开更多
关键词 Technology of Computer Application Bayesian Networks Learning Algoritlmas College Student
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Optimization of parameters of a surface-electrode ion trap and experimental study of influences of surface on ion lifetime
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作者 BaoQuan Ou Jie Zhang +5 位作者 XinFang Zhang Yi Xie Ting Chen chunwang wu Wei wu PingXing Chen 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2016年第12期33-39,共7页
In this paper we report the optimal design and fabrication of a gold-on-silica linear segmented surface-electrode ion trap. By optimizing the thickness and width of the electrodes, we improved the trapping ability and... In this paper we report the optimal design and fabrication of a gold-on-silica linear segmented surface-electrode ion trap. By optimizing the thickness and width of the electrodes, we improved the trapping ability and trap scalability. By using some practical experimental operation methods, we successfully minimized the trap heating rate. Consequently, we could trap a string of up to 38 ions, and a zigzag structure with 24 ions, and transport two trapped ions to different zones. We also studied the influences of the ion chip surface on the ion lifetime. The excellent trapping ability and flexibility of operation of the planar ion trap shows that it has high feasibility for application in the development a practical quantum information processor or quantum simulator. 展开更多
关键词 quantum information processor quantum simulator ion trap surface-electrode trap ion string ion transportation
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