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1 × N DWDM channel selective quantum frequency conversion
Optics Express
|February 18, 2026
Summary
We developed channel-selective quantum frequency conversion (CS-QFC) for quantum internet. This technology enables dynamic routing of photons across dense wavelength division multiplexing (DWDM) channels, crucial for high-capacity quantum networks.
Area of Science:
- Quantum communication networks
- Quantum information science
- Photonics and optical communications
Background:
- Dense wavelength division multiplexing (DWDM) is vital for high-capacity quantum networks.
- Quantum frequency conversion (QFC) is essential for integrating quantum systems over fiber optics.
- Existing QFC methods lack the flexibility needed for future quantum internet.
Purpose of the Study:
- To present a novel channel-selective quantum frequency conversion (CS-QFC) technique.
- To enable dynamic photon routing across DWDM channels for quantum internet applications.
- To demonstrate CS-QFC using difference frequency generation in a PPLN waveguide.
Main Methods:
- Utilized difference frequency generation in a periodically poled lithium niobate (PPLN) waveguide.
- Employed dynamically selected pump lasers to achieve channel-selective conversion.
- Demonstrated conversion from 780 nm to 1540 nm using pump lasers around 1580 nm with 25 GHz spacing.
Main Results:
- Achieved an output-frequency tunability of 2.5 THz, enabling a 100-channel DWDM dynamic link.
- Successfully routed photon pairs into seven distinct DWDM channels.
- Preserved nonclassical cross-correlation functions and observed no crosstalk between channels.
Conclusions:
- CS-QFC is a viable technology for building frequency-multiplexed quantum networks.
- The demonstrated CS-QFC system supports flexible and scalable quantum communication.
- This work paves the way for advanced quantum internet infrastructure.
