Experimental verification of high spectral entanglement for pulsed waveguided spontaneous parametric down-conversion

M. Avenhaus; M. V. Chekhova; Leonid Krivitsky; G. Leuchs; C. Silberhorn

doi:10.1103/PhysRevA.79.043836

Experimental verification of high spectral entanglement for pulsed waveguided spontaneous parametric down-conversion

M. Avenhaus, M. V. Chekhova, Leonid Krivitsky, G. Leuchs, C. Silberhorn

Department of Physics

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Abstract

We study the spectral properties of spontaneous parametric down-conversion (SPDC) in a periodically poled waveguided structure of potassium-titanyl-phosphate (KTP) crystal pumped by ultrashort pulses. Our theoretical analysis reveals a strongly entangled and asymmetric structure of the two-photon spectral amplitude for type-II SPDC. We confirm these predictions experimentally by measuring single-photon spectra, on one hand, and the dependence of Hong-Ou-Mandel interference visibility on the width of spectral filtering, on the other hand.

Original language	English
Journal	Physical Review A
Volume	79
Issue number	4
Pages (from-to)	043836
ISSN	2469-9926
DOIs	https://doi.org/10.1103/PhysRevA.79.043836
Publication status	Published - 2009

Bibliographical note

Keywords

quantum entanglement
quantum optics
two-photon spectra
high-speed optical techniques
optical frequency conversion
optical pumping
optical waveguide filters

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10.1103/PhysRevA.79.043836

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abstract = "We study the spectral properties of spontaneous parametric down-conversion (SPDC) in a periodically poled waveguided structure of potassium-titanyl-phosphate (KTP) crystal pumped by ultrashort pulses. Our theoretical analysis reveals a strongly entangled and asymmetric structure of the two-photon spectral amplitude for type-II SPDC. We confirm these predictions experimentally by measuring single-photon spectra, on one hand, and the dependence of Hong-Ou-Mandel interference visibility on the width of spectral filtering, on the other hand.",

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AU - Avenhaus, M.

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AU - Leuchs, G.

AU - Silberhorn, C.

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AB - We study the spectral properties of spontaneous parametric down-conversion (SPDC) in a periodically poled waveguided structure of potassium-titanyl-phosphate (KTP) crystal pumped by ultrashort pulses. Our theoretical analysis reveals a strongly entangled and asymmetric structure of the two-photon spectral amplitude for type-II SPDC. We confirm these predictions experimentally by measuring single-photon spectra, on one hand, and the dependence of Hong-Ou-Mandel interference visibility on the width of spectral filtering, on the other hand.

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KW - quantum optics

KW - two-photon spectra

KW - high-speed optical techniques

KW - optical frequency conversion

KW - optical pumping

KW - optical waveguide filters

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Experimental verification of high spectral entanglement for pulsed waveguided spontaneous parametric down-conversion

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