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    We developed an atomic filter for high-purity photon pairs from optical parametric oscillators (OPOs). This filter enables advanced quantum states for quantum networking and atomic quantum metrology.

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    Area of Science:

    • Quantum Optics
    • Atomic Physics
    • Quantum Information Science

    Background:

    • Sub-threshold optical parametric oscillators (OPOs) generate frequency-degenerate photon pairs.
    • Existing filtering methods struggle to maintain photon pair purity and non-classical features.

    Purpose of the Study:

    • To demonstrate an atomic filter for high-fidelity frequency-degenerate photon pairs from an OPO.
    • To enable generation of atom-resonant hybrid quantum states.

    Main Methods:

    • Utilized a modified Faraday anomalous dispersion optical filter (FADOF) for atomic filtering.
    • Applied the FADOF to the output of a sub-threshold OPO.
    • Performed correlation and atomic absorption measurements for spectral purity assessment.

    Main Results:

    • Achieved 70% peak transmission with 57 dB out-of-band rejection and 445 MHz bandwidth.
    • Successfully filtered degenerate photon pairs, preserving one-mode squeezed vacuum.
    • Demonstrated 96% spectral purity for individual photons and 98% for photon pairs.

    Conclusions:

    • The developed atomic filter provides high spectral purity and transmission for photon pairs.
    • This technique facilitates the creation of exotic quantum states like "Schrödinger kittens".
    • Enables applications in quantum networking and atomic quantum metrology.