约瑟夫森结跳变电流统计分布测量系统  

The Measurement System of Statistical Distribution of the Switching Current of a Single Josephson Junction

作　　者：王颖[1] 许伟伟[1] 孙国柱[1] 陈健[1] 曹俊宇[1] 丛山桦[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学研究所,江苏南京210093

出　　处：《电子学报》2007年第5期823-826,共4页Acta Electronica Sinica

基　　金：国家自然科学基金(No.10474036;No.60571007);国家863项目(No.2006AA03Z214);教育部博士点基金(No.2004028033);国防科技重点实验室基金(No.51473040105JW1101)

摘　　要：本文详细介绍了一种通过对时间的测量来获得单个约瑟夫森结(JJ)跳变电流统计分布P(I)的测量系统,包括致冷系统和测量方案.我们还在测量电路中采取了电磁屏蔽、低通滤波、接地等一系列的降噪措施,使得实验所能测量到的约瑟夫森结的最低等效温度进一步的降低至300mK.A system, which measures the statistical distribution of the switching current of a single Josephson junction （JJ） based on time-resolved measurement,is introduced. This system includes both the refrigeration system and the raeasurement method. Moreover, we tried several techniques to reduce the noise, such as electromagnetic shielding, low-pass filter and ground connection, and the lowest equivalent temperature of JJ in the experiment was reduced to 300mK.

关 键 词：约瑟夫森结 超导 超导量子比特 降噪 

分 类 号：O514[理学—低温物理] O511.4[理学—物理]