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Experimental entangled photon pair generation using crystals with parallel optical axes.

Aitor Villar, Alexander Lohrmann, Alexander Ling

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    Summary
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    This study introduces an optical design for generating polarization-entangled photon pairs using two parallel-aligned beta-Barium Borate crystals. This method improves spatial overlap, enhancing single-mode collection efficiency and achieving high quantum state fidelity.

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    Area of Science:

    • Quantum optics
    • Photonics
    • Crystallography

    Background:

    • Entangled photon pair generation is crucial for quantum information technologies.
    • Efficient spatial mode overlap is key for high-fidelity quantum state preparation.
    • Beta-Barium Borate (BBO) crystals are widely used nonlinear optical materials.

    Purpose of the Study:

    • To present a novel optical design for generating polarization-entangled photon pairs.
    • To enhance spatial mode overlap and single-mode collection efficiency.
    • To achieve high quantum state fidelity in entangled photon pair generation.

    Main Methods:

    • Utilizing two beta-Barium Borate (BBO) crystals with parallel optical axes.
    • Employing an elliptical spatial profile for pumping the crystals.
    • Measuring the photon pair generation rate and quantum state fidelity.

    Main Results:

    • Achieved a photon pair rate of at least 65,000 pairs/s/mW.
    • Obtained a high quantum state fidelity of 99.53 ± 0.22%.
    • Demonstrated enhanced spatial mode overlap without spatial walk-off compensators.

    Conclusions:

    • The proposed optical design effectively generates polarization-entangled photon pairs with high fidelity.
    • The parallel alignment of BBO crystals enhances spatial mode overlap and simplifies collection.
    • This design offers a promising approach for scalable quantum optical systems.