Asymmetric Gaussian harmonic steering in second-harmonic generation

Olsen, M.K. (2013) Asymmetric Gaussian harmonic steering in second-harmonic generation. Physical Review A - Atomic, Molecular, and Optical Physics, 88 5: 051802-1-051802-4. doi:10.1103/PhysRevA.88.051802

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Author Olsen, M.K.
Title Asymmetric Gaussian harmonic steering in second-harmonic generation
Journal name Physical Review A - Atomic, Molecular, and Optical Physics   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2013-11-21
Year available 2013
Sub-type Article (original research)
DOI 10.1103/PhysRevA.88.051802
Open Access Status File (Publisher version)
Volume 88
Issue 5
Start page 051802-1
End page 051802-4
Total pages 5
Place of publication College Park, MD United States
Publisher American Physical Society
Collection year 2014
Language eng
Subject 3107 Atomic and Molecular Physics, and Optics
Abstract Intracavity second-harmonic generation is one of the simplest of the quantum optical processes and is well within the expertise of most optical laboratories. It is well understood and characterized, both theoretically and experimentally. We show that it can be a source of continuous-variable asymmetric Gaussian harmonic steering with fields which have a coherent excitation, hence combining the important effects of harmonic entanglement and asymmetric steering in one easily controllable device, adjustable by the simple means of tuning the cavity loss rates at the fundamental and harmonic frequencies. We find that whether quantum steering is available via the standard measurements of the Einstein-Podolsky-Rosen correlations can depend on which quadrature measurements are inferred from output spectral measurements of the fundamental and the harmonic. Altering the ratios of the cavity loss rates can be used to tune the regions where symmetric steering is available, with the results becoming asymmetric over all frequencies as the cavity damping at the fundamental frequency becomes significantly greater than at the harmonic. This asymmetry and its functional dependence on frequency is a potential new tool for experimental quantum information science, with possible utility for quantum key distribution. Although we show the effect here for Gaussian measurements of the quadratures, and cannot rule out a return of the steering symmetry for some class of non-Gaussian measurements, we note here that the system obeys Gaussian statistics in the operating regime investigated and Gaussian inference is at least as accurate as any other method for calculating the necessary correlations. Perhaps most importantly, this system is simpler than any other methods we are aware of which have been used or proposed to create asymmetric steering.
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Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
 
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