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Deployed quantum link characterization via Bayesian ancilla-assisted process tomography.

Arefur Rahman, Noah I Wasserbeck, Zachary Goisman

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    PubMed
    Summary
    This summary is machine-generated.

    Researchers used ancilla-assisted process tomography (AAPT) to analyze a deployed quantum channel. This method confirmed stable, high-fidelity quantum communication over a 1.6 km fiber link, crucial for future quantum networks.

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    Area of Science:

    • Quantum Information Science
    • Quantum Communication
    • Experimental Physics

    Background:

    • Large-scale quantum networks depend on high-quality quantum channels.
    • Quantum process tomography is essential for quantifying channel performance.
    • Ancilla-assisted process tomography (AAPT) offers a method for channel characterization.

    Purpose of the Study:

    • To apply AAPT to a deployed fiber-optic quantum channel.
    • To assess the fidelity and stability of a 1.6 km quantum link.
    • To investigate the impact of spectral bandwidth on channel performance.

    Main Methods:

    • Utilized ancilla-assisted process tomography (AAPT) with Bayesian inference.
    • Probed a 1.6 km deployed fiber-optic link transmitting polarization-entangled photons.
    • Employed controllable spectral filtering to analyze varying bandwidths.

    Main Results:

    • Achieved a steady process fidelity of 97.6(1)% over a 24-hour monitoring period.
    • Observed that quantum channel fidelity increases with spectral bandwidth and then plateaus.
    • Demonstrated stable quantum channel operation with minimal polarization mode dispersion.

    Conclusions:

    • AAPT is a valuable tool for in situ analysis of deployed quantum links.
    • The study provides the first AAPT characterization of a deployed quantum link.
    • Results indicate suitability for entanglement-based quantum network development.