Abstract
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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1083-1084 |
| Number of pages | 2 |
| Journal | Physica B+C |
| Volume | 108 |
| Issue number | 1-3 |
| DOIs | |
| State | Published - 1981 |
| Externally published | Yes |
ASJC Scopus subject areas
- Engineering(all)
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Cite this
Van Harlingen, D. J., Koch, R. H., & Clarke, J. (1981). Dc SQUID near the quantum noise limit. Physica B+C, 108(1-3), 1083-1084. https://doi.org/10.1016/0378-4363(81)90845-7