A fiber-integrated quantum frequency converter down-converts 637 nm photons to 1588 nm telecom photons at 9% efficiency with 154 Hz noise, yielding modeled NV-center entanglement fidelity above 52% over 100 km.
Spectral noise in frequency conversion from the visible to the telecommunication c-band,
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Fiber-integrated Quantum Frequency Conversion for Long-distance Quantum Networking
A fiber-integrated quantum frequency converter down-converts 637 nm photons to 1588 nm telecom photons at 9% efficiency with 154 Hz noise, yielding modeled NV-center entanglement fidelity above 52% over 100 km.