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7 - Linear Detectors

Published online by Cambridge University Press:  10 May 2024

Andrew N. Jordan  and
Irfan A. Siddiqi
Andrew N. Jordan
Affiliation:
University of Rochester, New York
Irfan A. Siddiqi
Affiliation:
University of California, Berkeley
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Summary

In Chapter 7, we discuss the fundamental limits of quantum amplification. When quantum effects are amplified to classical signals, noise is added to the signal (there are exceptions, but other trade-offs come into play). A detailed discussion of linear response theory is given, which is applicable to many kinds of quantum-limited measurements. This theory is applied to mesoscopic charge detectors and resonant optical cavities. While fundamental bounds quantum mechanics gives to amplification are important, they do not tell you how to invent a quantum-limited amplifier.

Keywords

quantum amplifiersquantum noiselinear response theorycharge detectorsresonant optical cavities
Type
Chapter
Information
Quantum Measurement
Theory and Practice
 , pp. 153 - 168
Publisher: Cambridge University Press
Print publication year: 2024

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