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Related Experiment Video

Updated: Jan 22, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Auto-balancing and robust interferometer designs for polarization entangled photon sources.

Rolf Horn, Thomas Jennewein

    Optics Express
    |June 30, 2019
    PubMed
    Summary

    A novel Mach-Zehnder interferometer simplifies coherent optical wavelength conversion. This robust design is a benchmark for high-fidelity polarization entangled photon sources.

    Area of Science:

    • Quantum optics
    • Photonics engineering

    Background:

    • Mach-Zehnder interferometers are crucial for optical experiments.
    • Dispersion can cause phase discrepancies in optical systems, affecting performance.
    • Generating polarization entangled photon pairs is vital for quantum information processing.

    Purpose of the Study:

    • To present a new Mach-Zehnder interferometer implementation.
    • To enable efficient coherent optical wavelength conversion.
    • To serve as a benchmark for polarization entangled photon sources.

    Main Methods:

    • Developed a novel double displacement technique within the interferometer.
    • Eliminated dispersion-induced phase discrepancies between interferometer arms.
    • Integrated the interferometer into a source of polarization entangled photon pairs.

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    Main Results:

    • The interferometer successfully facilitated coherent optical wavelength conversion.
    • The entangled photon source produced 2-3 million photon pairs/sec/mW.
    • Achieved maximal entanglement fidelity of ≥98% in the polarization degree of freedom.

    Conclusions:

    • The new interferometer implementation is simple and robust.
    • The design effectively eliminates dispersion-induced phase discrepancies.
    • This interferometer is a promising benchmark for future entangled photon sources.