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.
出处
《电子学报》
EI
CAS
CSCD
北大核心
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)
关键词
约瑟夫森结
超导
超导量子比特
降噪
Josephson junction
superconductor
superconducting qubit
noise reduction
