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Quantum Machines: Measurement and Control of Engineered Quantum SystemsLecture Notes of the Les Houches Summer School: Volume 96, July 2011$
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Michel Devoret, Benjamin Huard, Robert Schoelkopf, and Leticia F. Cugliandolo

Print publication date: 2014

Print ISBN-13: 9780199681181

Published to Oxford Scholarship Online: September 2014

DOI: 10.1093/acprof:oso/9780199681181.001.0001

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SQUID amplifiers

SQUID amplifiers

(p.427) 12 SQUID amplifiers
Quantum Machines: Measurement and Control of Engineered Quantum Systems

J. Clarke

M. H. Devoret

A. Kamal

Oxford University Press

This chapter treats the concrete example of the microwave SQUID, a practical quantum-limited amplifier. The appeal of the SQUID is that it is sufficiently sophisticated to be used in a variety of applications, yet sufficiently simple to allow a detailed analysis of the origin of noise and its processing through the active elements of the device. In particular, the noise of the SQUID can be understood as the mixed-down counterpart of the Johnson noise of the SQUID resistors in the vicinity of the Josephson frequency and its harmonics. The ultimate performances of the microwave SQUID amplifier are discussed.

Keywords:   SQUID, quantum-limited amplifier, Johnson noise, Josephson frequency

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