QUANTUM NOISE THEORY FOR THE dc SQUID
The noise temperature of a de SQUID coupled to a tuned input circuit is computed using the complete quantum expression for the equilibrium noise in the shunt resistance of each junction. At T=0, where the noise reduces to zero-point fluctuations. the noise temperature for an optimized system is h{nu}/k{sub B}ln2, where {nu} is the signal frequency. The computation is extended to non-zero temperatures, and it is shown that a SQUID operated at 1K can approach the quantum limit.
- Research Organization:
- Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
- Sponsoring Organization:
- Materials Sciences Division
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1090445
- Report Number(s):
- LBL-11729
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 5 Vol. 38; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
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