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Indistinguishable single photons at Telecom wavelength: a spontaneous parametric down-conversion source using a ppKTP crystal and quasi-phase matching / Stefan Rahim

Stefan Alexander Rahim

Published May 1, 2020• 0 citations
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Related papers

Pulsed source of spectrally uncorrelated and indistinguishable photons at telecom wavelengths

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We report on the generation of indistinguishable photon pairs at telecom wavelengths based on a type-II parametric down conversion process in a periodically poled potassium titanyl phosphate (PPKTP) crystal. The phase matching, pump laser characteristics and coupling geometry are optimised to obtain spectrally uncorrelated photons with high coupling efficiencies. Four photons are generated by a counter-propagating pump in the same crystal and anlysed via two photon interference experiments between photons from each pair source as well as joint spectral and g((2)) measurements. We obtain a spectral purity of 0.91 and coupling efficiencies around 90% for all four photons without any filtering. These pure indistinguishable photon sources at telecom wavelengths are perfectly adapted for quantum network demonstrations and other multi-photon protocols.

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We report on the generation of indistinguishable photon pairs at telecom wavelengths based on a type-II parametric down conversion process in a periodically poled potassium titanyl phosphate (PPKTP) crystal. The phase matching, pump laser characteristics and coupling geometry are optimised to obtain spectrally uncorrelated photons with high coupling efficiencies. Four photons are generated by a counter-propagating pump in the same crystal and anlysed via two photon interference experiments between photons from each pair source as well as joint spectral and g((2)) measurements. We obtain a spectral purity of 0.91 and coupling efficiencies around 90% for all four photons without any filtering. These pure indistinguishable photon sources at telecom wavelengths are perfectly adapted for quantum network demonstrations and other multi-photon protocols.

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Implementation of a bright frequency correlated photon pairs source based on a PPKTP crystal

María Fernanda Morris Garcés

The implementation of a bright frequency correlated photon pairs source based on a PPKTP requires two principal parts: the process of Spontaneous Parametric Down-Conversion SPDC taking into account the quasi-phase-matching conditions and a single-frequency-mode laser source with a Gaussian profile. In this project, a theoretical approach of the SPDC process and the conditions needed to have an intense source of correlated photon pairs source are studied; especially, the process dependence of the temperature of the crystal and the pump wavelength. A single-frequency-mode pump laser source is implemented and focused to a PPKTP crystal. The photon pairs source is characterized spatially, in intensity and frequency. Through this, a bright photon pairs source with a coincidence rate per mW of pump power of 199 +- 1 kHz/mW is obtained, which is at least three times bigger than the rate of coincidences of the SPDC process using a traditional nonlinear crystal as a BBO.

•Jan 1, 2021•0 citations

Frequency down-conversion of single photons into the telecom band

Olivares-Rentería, Ottaviani, Morigi +4 more

Conference on Lasers and Electro-Optics•Jan 1, 2010•0 citations
We report on the generation of indistinguishable photon pairs at telecom wavelengths based on a type-II parametric down conversion process in a periodically poled potassium titanyl phosphate (PPKTP) crystal. The phase matching, pump laser characteristics and coupling geometry are optimised to obtain spectrally uncorrelated photons with high coupling efficiencies. Four photons are generated by a counter-propagating pump in the same crystal and anlysed via two photon interference experiments between photons from each pair source as well as joint spectral and g((2)) measurements. We obtain a spectral purity of 0.91 and coupling efficiencies around 90% for all four photons without any filtering. These pure indistinguishable photon sources at telecom wavelengths are perfectly adapted for quantum network demonstrations and other multi-photon protocols.
We report on the generation of indistinguishable photon pairs at telecom wavelengths based on a type-II parametric down conversion process in a periodically poled potassium titanyl phosphate (PPKTP) crystal. The phase matching, pump laser characteristics and coupling geometry are optimised to obtain spectrally uncorrelated photons with high coupling efficiencies. Four photons are generated by a counter-propagating pump in the same crystal and anlysed via two photon interference experiments between photons from each pair source as well as joint spectral and g((2)) measurements. We obtain a spectral purity of 0.91 and coupling efficiencies around 90% for all four photons without any filtering. These pure indistinguishable photon sources at telecom wavelengths are perfectly adapted for quantum network demonstrations and other multi-photon protocols.
The implementation of a bright frequency correlated photon pairs source based on a PPKTP requires two principal parts: the process of Spontaneous Parametric Down-Conversion SPDC taking into account the quasi-phase-matching conditions and a single-frequency-mode laser source with a Gaussian profile. In this project, a theoretical approach of the SPDC process and the conditions needed to have an intense source of correlated photon pairs source are studied; especially, the process dependence of the temperature of the crystal and the pump wavelength. A single-frequency-mode pump laser source is implemented and focused to a PPKTP crystal. The photon pairs source is characterized spatially, in intensity and frequency. Through this, a bright photon pairs source with a coincidence rate per mW of pump power of 199 +- 1 kHz/mW is obtained, which is at least three times bigger than the rate of coincidences of the SPDC process using a traditional nonlinear crystal as a BBO.