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Related Experiment Video

Updated: Jul 6, 2025

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Designing noise-robust quantum networks coexisting in the classical fiber infrastructure.

Jordan M Thomas, Gregory S Kanter, Prem Kumar

    Optics Express
    |January 5, 2024
    PubMed
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    Integrating quantum and classical communications in shared fibers is key for quantum networking. This study optimizes wavelength combinations to minimize Raman scattering noise, improving quantum channel performance.

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    Area of Science:

    • Quantum communication
    • Optical networking
    • Photonics

    Background:

    • Scalable quantum networking requires integrating quantum and classical communications in shared optical fibers.
    • Spontaneous Raman scattering (SRS) noise poses a significant challenge to this coexistence.
    • Optimizing wavelength allocation is crucial for mitigating SRS noise and ensuring signal integrity.

    Purpose of the Study:

    • To investigate the coexistence of multi-channel O-band quantum and C-band classical communications in standard optical fiber.
    • To characterize the impact of high-power classical channels on quantum channels.
    • To identify optimal wavelength combinations for minimizing noise and maximizing quantum channel performance.

    Main Methods:

    • Co-propagation of narrowband entangled photon pair channels (1282 nm-1318 nm) with C-band classical communications over 48 km of installed standard fiber.
    • Characterization of quantum channel performance under record C-band power levels (>18 dBm).
    • Analysis of the Raman noise spectrum and multi-photon pair emission.

    Main Results:

    • Demonstrated significant performance differences between various quantum-classical wavelength combinations.
    • Identified specific wavelength pairings that outperform others in terms of quantum channel fidelity and noise resilience.
    • Quantified the impact of high-power classical channels on quantum signal-to-noise ratio.

    Conclusions:

    • Successful co-propagation of O-band quantum and C-band classical signals is achievable with careful wavelength management.
    • Wavelength engineering is a critical factor in mitigating Raman scattering noise for future quantum networks.
    • The findings provide essential insights for designing and deploying scalable, hybrid quantum-classical communication systems.