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1 results

  • 7 - Linear Detectors

  • Andrew N. Jordan, University of Rochester, New York, Irfan A. Siddiqi, University of California, Berkeley
  • Book:
    Quantum Measurement
    Published online:
    10 May 2024
    Print publication:
    15 February 2024, pp 153-168

  • 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.