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Related Experiment Video

Updated: Jan 19, 2026

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Quantum optical frequency up-conversion for polarisation entangled qubits: towards interconnected quantum information

Florian Kaiser, Panagiotis Vergyris, Anthony Martin

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    |September 13, 2019
    PubMed
    Summary

    Researchers developed a quantum frequency conversion device to link different quantum systems. This breakthrough enables coherent quantum information transfer, crucial for building a global quantum network.

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    Area of Science:

    • Quantum networking
    • Quantum information science
    • Photonics

    Background:

    • Global quantum networks require integrating diverse quantum systems (flying and stationary qubits).
    • Coherent quantum information transfer between systems is hindered by differing properties like wavelength and wavepacket.
    • Existing quantum photonics systems face challenges in interfacing with quantum memories operating at different wavelengths.

    Purpose of the Study:

    • To demonstrate a polarization-preserving quantum frequency conversion device.
    • To enable the transfer of quantum information between telecom wavelengths and the near-infrared spectrum.
    • To overcome wavelength mismatch challenges in quantum photonics for network integration.

    Main Methods:

    • Development of a guided-wave quantum frequency conversion device.
    • Utilizing polarization-preserving optics for coherent information transfer.
    • Characterization via single photon state transfer tomography and entanglement fidelity measurements.

    Main Results:

    • Successful conversion of telecom wavelength photons to the near-infrared spectrum.
    • Demonstration of a noise-free conversion process with near-perfect single photon state transfer.
    • Observation of high-fidelity entanglement preservation after frequency conversion.

    Conclusions:

    • The developed device is a robust, compact, and adaptable building block for quantum networks.
    • This technology facilitates the connection of quantum information systems based on light and matter.
    • Represents a significant advancement towards realizing a universal global quantum network.