约瑟夫森结跳变电流在微波辐照下的分布  

CURRENT-BIASED JOSEPHSON JUNCTION

作　　者：曹俊宇 孙国柱[1] 王轶文 陈健[1] 吴培亨[1] 

机构地区：[1]南京大学电子科学与工程系超导电子研究所,南京210093

出　　处：《低温物理学报》2007年第3期196-199,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金(项目编号:10474036;10534060);科技部重大基础研究计划"973计划"(项目编号:2006CB601006);教育部博士点基金(项目编号:2004028033)资助的课题~~

摘　　要：在16mK的极低温下,我们对电流偏置的Nb/AlOx/Nb结进行了跳变电流统计分布的测量.在没有外加微波的辐照时,分布曲线只有一个峰;在有外加微波的辐照时,其跳变电流的统计分布除了基峰外,会出现谐振峰,形成双峰结构.该谐振峰的位置和结的量子化的能级相关,其高度随外加微波功率的改变而改变.研究约瑟夫森结跳变电流在微波辐照下的分布,对于研究超导量子比特的能级量子化、Rabi振荡等具有重要的意义.At the extremely low temperature of 16mK, current-biased Nb/AlOx/Nb Josephson junction. one peak in the distribution curve. With the we measured the switching current distribution in a Without the irradiation of microwave, there was only irradiation of microwave, we observed double-peak structure. The microwave-induced resonant peak was related to the quantized energy level in the Josephson junction. Its height value varied with the power of microwave. The investigation of the switching current distribution under the microwave irradiation is very meaningful to characterize the quantum mechanics such as energy level quantization and Rabi oscillation.

关 键 词：跳变电流统计分布 约瑟夫森结 超导量子比特 

分 类 号：O513[理学—低温物理]