Squeezing via feedback

Wiseman, H. M. and Milburn, G. J. (1994) Squeezing via feedback. Physical Review A, 49 2: 1350-1366. doi:10.1103/PhysRevA.49.1350

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Author Wiseman, H. M.
Milburn, G. J.
Title Squeezing via feedback
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 1994-02-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.49.1350
Open Access Status File (Publisher version)
Volume 49
Issue 2
Start page 1350
End page 1366
Total pages 17
Place of publication College Park, MD 20740 United States
Publisher American Physical Society
Language eng
Abstract We present the quantum theory of optical cavity feedback mediated by homodyne detection, with an arbitrary time delay. We apply this theory to a system with nonclassical dynamics, a sub-Poissonian pumped laser. By using the feedback to phase lock the laser it is possible to produce output light which exhibits perfect quadrature squeezing on resonance, rather than just sub-Poissonian intensity statistics. However, we also show that feedback mediated by homodyne detection (or any other extracavity measurement) cannot produce nonclassical light unless the cavity dynamics can do so without feedback. Furthermore, in systems which already exhibit squeezing, such feedback can only degrade the squeezing in the output. With feedback mediated by an intracavity measurement, these theorems do not apply. We show that an (admittedly unrealistic) intracavity quantum nondemolition quadrature measurement allows arbitrary squeezing to be produced by controlling the amplitude of a coherent driving field.
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Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 135 times in Thomson Reuters Web of Science Article | Citations
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