TY - JOUR
T1 - Dc SQUID near the quantum noise limit
AU - Van Harlingen, Dale J.
AU - Koch, Roger H.
AU - Clarke, John
N1 - Funding Information:
This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Science Division, U.S. Department of Energy under contract No. W-7405-ENG-48. We are indebted to the Microelectronics Facility in the Electronics Research Laboratory of the Electrical Engineering and Computer Science Department at U.C. Berkeley for the use of their facilities.
PY - 1981
Y1 - 1981
N2 - A series of dc SQUIDs has been fabricated in an attempt to obtain quantum-limited sensitivity. Typically, the SQUID inductance, L, is 2 pH, the capacitance and critical current of each tunnel junction are 0.5 pF and 0.5 mA, and the shunt resistance for each junction is 1Ω. The measured spectral density of the voltage noise Sv contains a 1/f component that extends typically to 100 kHz or higher. When the 1/f component is subtracted out, the best energy sensitivity achieved to date is ε 1Hz = Sv 2L( ∂V ∂Φ)2 2 ̌ h {combining short stroke overlay}, where ∂V/∂Φ is the transfer coefficient.
AB - A series of dc SQUIDs has been fabricated in an attempt to obtain quantum-limited sensitivity. Typically, the SQUID inductance, L, is 2 pH, the capacitance and critical current of each tunnel junction are 0.5 pF and 0.5 mA, and the shunt resistance for each junction is 1Ω. The measured spectral density of the voltage noise Sv contains a 1/f component that extends typically to 100 kHz or higher. When the 1/f component is subtracted out, the best energy sensitivity achieved to date is ε 1Hz = Sv 2L( ∂V ∂Φ)2 2 ̌ h {combining short stroke overlay}, where ∂V/∂Φ is the transfer coefficient.
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U2 - 10.1016/0378-4363(81)90845-7
DO - 10.1016/0378-4363(81)90845-7
M3 - Article
AN - SCOPUS:0019599916
VL - 108
SP - 1083
EP - 1084
JO - Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics
JF - Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics
SN - 0165-1757
IS - 1-3
ER -