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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Efficient quantum frequency conversion for networking on the telecom E-band.

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    We developed a simple quantum frequency conversion device for silicon vacancy (SiV) centers, achieving 44.5% external efficiency. This breakthrough enhances quantum networking capabilities for SiV qubits.

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    Area of Science:

    • Quantum Information Science
    • Optics and Photonics
    • Materials Science

    Background:

    • High-efficiency quantum frequency conversion (QFC) is crucial for long-distance quantum networking using group-IV color centers like silicon vacancies (SiV).
    • QFC performance is sensitive to wavelength choices and device configurations (bulk vs. waveguide), influencing noise and efficiency.

    Purpose of the Study:

    • To design a simple quantum frequency conversion (QFC) device for silicon vacancy (SiV) color centers.
    • To achieve state-of-the-art performance in QFC for SiV centers suitable for quantum networking.

    Main Methods:

    • Utilized a C-band pump wavelength (1561 nm) for E-band network wavelength (1398 nm) in a one-stage, single-pass conversion scheme.
    • Employed high-quality erbium-doped fiber amplifiers to maximize the nonlinear conversion process.
    • Investigated noise characteristics, specifically anti-Stokes Raman scattering, and measured photon conversion efficiency.

    Main Results:

    • Achieved a record external photon conversion efficiency of 44.5 ± 1.8% (internal: 8.5 ± 1.8%) at 1.51 W external pump power.
    • Demonstrated a 9% (25%) increase in external (internal) efficiency compared to previous SiV QFC methods.
    • Measured a pump-generated noise spectral density of 4913 counts/s/nm, consistent with one-stage anti-Stokes conversion.

    Conclusions:

    • The proposed QFC device design offers a simple yet high-performance solution for SiV centers.
    • The achieved efficiency and noise levels are promising for practical quantum networking applications.
    • Further improvements could be realized by addressing fiber coupling efficiencies and exploring multi-stage conversion for noise reduction.