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Quantum Langevin equations for a two-mode parametric amplifier: Noise squeezing without negative diffusion

AuthorsSainz de los Terreros, L.; Bermejo, Francisco Javier
Issue Date1-Feb-1992
PublisherAmerican Physical Society
CitationPhysical review A 45: 1906- 1918 (1992)
AbstractThe theory of a two-mode nondegenerate parametric amplifier in a cavity is reformulated in terms of quadrature-phase-amplitude variables. The corrrespondence with a genuine classical stochastic linear process is found (non-negative-definite diffusion matrices) for the case of a cavity device immersed in thermal or ordinary (nonsqueezed) vacuum sources. A special kind of squeezing, i.e., quadrature squeezing [B. L. Schumaker, Phys. Rep. 135, 318 (1986)], is found to be characteristic of the internal steady state for the case of a cavity model subjected to an additional phase-sensitive noise source coupled to one of the two internal modes. Finally, the usual squeezing spectrum of the output field is calculated in both cases by means of an input-output formalism based upon a symmetric ordering scheme of noncommuting operators, well adapted for the quadrature-phase description of the fields involved in the interaction. © 1992 The American Physical Society.
Description13 págs.; 5 figs,; PACS number(s): 42.50.Dv, 42.50.Kb
Publisher version (URL)https://doi.org/10.1103/PhysRevA.45.1906
Identifiersdoi: 10.1103/PhysRevA.45.1906
issn: 1050-2947
Appears in Collections:(CFMAC-IEM) Artículos
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