Quantum noise and active feedback

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Quantum mechanics limits the noise performance of linear amplifiers, and these limits, in turn, restrict the effects of active feedback on the noise level of any device which uses feedback from such an amplifier. I present a simple quantum-mechanical characterization of feedback, and use this method to determine the limiting noise levels of active filters and oscillators. The results clarify the role of the amplifier in the measurement process and illustrate the limits of a Langevin treatment of quantum noise.

Original languageEnglish (US)
Pages (from-to)2096-2098
Number of pages3
JournalPhysical Review D
Volume28
Issue number8
DOIs
StatePublished - Jan 1 1983
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Quantum noise and active feedback'. Together they form a unique fingerprint.

  • Cite this