dc SQUID: Current noise

✍ Scribed by Claudia D. Tesche; John Clarket

• Publisher: Springer US
• Year: 1979
• Tongue: English
• Weight: 208 KB
• Volume: 37
• Category: Article
• ISSN: 0022-2291
• DOI: 10.1007/bf00119197

✦ Synopsis

The cotnputer model used by Tesche and Clarke to calculate the voltage noise across the dc SQUID is extended to calculate the circulating current noise around the SQUID loop, and the correlation between the circulating current noise and the voltage noise across the SQUID. The parameters chosen are fl = 2LIo/~o = I, I" = 2~'kBT/Io~o = 0.05, and an applied flux Oleo~4 (L is the SQUID inductance, Io is the critical current per function, T is the temperature, and qbo is the flux quantum). At frequencies well below the Josephson frequency and at the optimum current bias, the voltage power spectral density is approximately 16 kuTR, the current power spectral density is approximately l l kB T / R and the voltage-current correlation spectral density is approximately 12kBT, where R is the resistance per junction.