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Open Access item Spatial quantum correlations in the fluorescence of traveling-wave second-harmonic generation

Authors:Scotto, Pierre
Keywords:[PACS] Quantum fluctuations, quantum noise, and quantum jumps, [PACS] Nonclassical states of the electromagnetic field, including entangled photon states; quantum state engineering and measurements, [PACS] Frequency conversion; harmonic generation, including higher-order harmonic generation
Issue Date:29-Sep-2003
Publisher:American Physical Society
Citation:Physical Review A 68(3): 033814 (2003)
Abstract:We investigate theoretically the spatial quantum correlations of the light produced by spontaneous emission in type-I second-harmonic generation in the traveling-wave configuration. It is first shown that spontaneous emission occurs at both fundamental and second-harmonic frequency. Considering the quantum fluctuations of the intensities collected in symmetrical parts of the far-field plane, nonclassical correlations below the shot noise are predicted not only at fundamental frequency, but also at second-harmonic frequency. The latter cannot be traced back to any twin-photon emission mechanism, but are generated by a secondary process acting on twin photons. This mechanism also creates correlations between fundamental and second-harmonic field, at a given transverse wave number, and at opposite wave numbers. The analysis of a simplified few-mode model, on a quantum level, provides a good qualitative understanding of these correlations.
Description:15 pages, 14 figures.-- PACS nrs.: 42.50.Lc, 42.50.Dv, 42.65.Ky.
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevA.68.033814
Appears in Collections:(IFISC) Artículos

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