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Study on a polarization-entangled photon-pair source based on niobium-doped potassium titanyl phosphate

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Abstract

We investigate the high-purity polarization-entangled photon-pair generation in niobium-doped potassium titanyl phosphate (Nb:KTP). The technique is based on Type II spontaneous parametric down-conversion (SPDC). Two kinds of Nb:KTPs with Nb-doping concentrations of 3.4 mol% and 7.5 mol% will be considered in each periodically poled and non-poled case. The properties of Type II SPDC, including the range of the beam propagation direction (or the spectral range of photons) and the corresponding effective nonlinearities and beam walk-offs, will be discussed in detail both theoretically and numerically. This is followed by a joint spectral analysis is followed to quantify the heralded-state spectral purities of the photon pairs generated by Type II SPDC. The results show that photon-pairs can be generated with high purities of 0.995–0.997 with proper pump filtering. We will also show that the spectral positions of photon pairs can be chosen from a wide range, including 1520.0 nm, 1582.4 nm, 1811.6–1837.4 nm, and 1998.6–2026.8 nm.

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Acknowledgements

This research was funded by National Research Foundation of Korea (NRF-2019R1F1A1063937 and the Korea Institute of Science and Technology (KIST) (2E29580-19-147); Institute for Information & communications Technology Promotion (IITP) grant funded by the Korea government (MSIT) (No. 2020-0-00947).

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  1. Department of Applied Physics, Institute of Natural Science, Kyung Hee University, Yongin-si, 17104, South Korea

    Donghwa Lee, Ilhwan Kim & Kwang Jo Lee

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  1. Donghwa Lee
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Correspondence to Kwang Jo Lee.

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Lee, D., Kim, I. & Lee, K.J. Study on a polarization-entangled photon-pair source based on niobium-doped potassium titanyl phosphate. J. Korean Phys. Soc. 78, 776–783 (2021). https://doi.org/10.1007/s40042-021-00139-6

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