Optimization of dc SQUID linear amplifiers and the quantum noise limit

Journal Article · Wed Sep 01 00:00:00 EDT 1982 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.93542· OSTI ID:5144675

Tesche, C D

A model for inductively coupled linear amplifier and magnetometer circuits employing superconducting quantum interference devices (dc SQUID's), which is accurate to all values in the coupling strength, is described. The model explicitly includes the interaction between the input circuit and the dc SQUID. The optimization of the untuned linear amplifier is discussed in detail. The uncertainty principle constraint on the noise temperature of a linear amplifier is shown to place a constraint on the minimum achievable values of the noise figures of an isolated dc SQUID in the quantum noise limit.

• Research Organization: I.B.M. Thomas J. Watson Research Center, Yorktown Heights, New York 10598
• OSTI ID: 5144675
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 41:5; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCURACY
AMPLIFIERS
CURRENTS
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
INTERACTIONS
MAGNETOMETERS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NOISE
OPTIMIZATION
SQUID DEVICES
SUPERCONDUCTING DEVICES
UNCERTAINTY PRINCIPLE