Towards spontaneous parametric down-conversion at low temperatures

The possibility of observing spontaneous parametric down-conversion in doped nonlinear crystals at low temperatures, which would be useful for combining heralded single-photon sources and quantum memories, is studied theoretically. The ordinary refractive index of a lithium niobate crystal doped wit...

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Bibliographic Details
Published in:EPJ Web of conferences 2017, Vol.161, p.2002
Main Authors: Akatiev, Dmitrii, Boldyrev, Kirill, Kuzmin, Nikolai, Latypov, Ilnur, Popova, Marina, Shkalikov, Andrey, Kalachev, Alexey
Format: Article
Language:English
Subjects:
Conversion
Deoxidizing
Helium
Liquid helium
Liquid nitrogen
Lithium niobates
Magnesium oxide
Refractivity
Superconductors (materials)
Synchronism
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Summary:The possibility of observing spontaneous parametric down-conversion in doped nonlinear crystals at low temperatures, which would be useful for combining heralded single-photon sources and quantum memories, is studied theoretically. The ordinary refractive index of a lithium niobate crystal doped with magnesium oxide LiNbO3:MgO is measured at liquid nitrogen and helium temperatures. On the basis of the experimental data, the coefficients of the Sellmeier equation are determined for the temperatures from 5 to 300 K. In addition, a poling period of the nonlinear crystal has been calculated for observing type-0 spontaneous parametric down-conversion (ooo-synchronism) at the liquid helium temperature under pumping at the wavelength of λp = 532 nm and emission of the signal field at the wavelength of λs = 794 nm, which corresponds to the resonant absorption line of Tm3+ doped ions.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/201716102002