Abstract
SQUID’s (Superconducting quantum interference devices) and other amplifiers are modeled by ideal noiseless linear amplifiers with current in and voltage en noise sources in their input circuits. For independent sources at frequency v the uncertainty principle requires that (e2ni2n)1/2 ≳2hv, where h is Planck’s constant. This limits the intrinsic energy sensitivity ε=Φ2n/2L of a SQUID of inductance L and effective flux noise power Φ2n to ε≳εmin=(e2ni2n)1/2 /2πν=h/π. Correlation of the noise sources or mismatch of the SQUID inductance is shown to degrade εmin.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
