Dependence of Switching Current Distribution of a Current-Biased Josephson Junction on Microwave Frequency  

作　　者：翟计全 李永超 史建新 周渝 李小虎 许伟伟 孙国柱 吴培亨 

机构地区：[1]Research Institute of Superconductor Electronics,School of Electronic Science and Engineering,Nanjing University

出　　处：《Chinese Physics Letters》2015年第4期118-121,共4页中国物理快报（英文版）

基　　金：Supported by the National Basic Research Program of China under Grant Nos 2011CBA00107,2011CB922104 and2011CBA00202;the National Natural Science Foundation of China under Grant Nos 61371036,11234006,11227904 and 11474154;the Natural Science Foundation of Jiangsu Province under Grant No BK2012013;the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant No 20120091110030;the Dengfeng Project B of Nanjing University,Jiangsu Key Laboratory of Advanced Manipulating Techniques of Electromagnetic Waves;the Priority Academic Program Development of Jiangsu Higher Education Institutions

摘　　要：We investigate the distribution of the switching current of a current-biased Josephson junction （CBJJ） and its dependence on the microwave frequency using two theoretical methods, one of which is the quantum trajectory method and the other is the master equation method. Both the methods show that the distribution of the switching current of CBJJ will exhibit double peaks in a certain range of microwave frequency if proper microwave power is given, and the gap between the two peaks will increase with the microwave frequency. The obtained results can be used to identify the energy difference of the ground and first excited states in a Josephson junction for any bias current.We investigate the distribution of the switching current of a current-biased Josephson junction （CBJJ） and its dependence on the microwave frequency using two theoretical methods, one of which is the quantum trajectory method and the other is the master equation method. Both the methods show that the distribution of the switching current of CBJJ will exhibit double peaks in a certain range of microwave frequency if proper microwave power is given, and the gap between the two peaks will increase with the microwave frequency. The obtained results can be used to identify the energy difference of the ground and first excited states in a Josephson junction for any bias current.

关 键 词：Dependence of Switching Current Distribution of a Current-Biased Josephson Junction on Microwave Frequency 

分 类 号：O413[理学—理论物理]