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On the Improvement of the Degree of Polarization Entanglement in the Double-Crystal Scheme of Spontaneous Parametric Down-Conversion

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A method has been proposed to improve the degree of polarization entanglement of biphotons obtained by means of a double-crystal scheme. The effect of deviation of the polarization of spontaneous parametric down-converted radiation on the degree of polarization entanglement of biphotons has been examined theoretically and experimentally. The dependence of the concurrence as a measure of entanglement on the difference between the pump phases in the nonlinear crystals of the double-crystal scheme has been studied experimentally, and the improvement of the concurrence by a factor of 2.7 has been achieved at the optimal phase difference.

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Funding

This work was supported by the Russian Science Foundation, project no. 21-12-00155.

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  1. Faculty of Physics, Moscow State University, 119991, Moscow, Russia

    D. N. Frolovtsev & S. A. Magnitskiy

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  1. D. N. Frolovtsev
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  2. S. A. Magnitskiy
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Correspondence to D. N. Frolovtsev.

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Translated by R. Tyapaev

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Frolovtsev, D.N., Magnitskiy, S.A. On the Improvement of the Degree of Polarization Entanglement in the Double-Crystal Scheme of Spontaneous Parametric Down-Conversion. Jetp Lett. 119, 64–69 (2024). https://doi.org/10.1134/S0021364023603500

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