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Published on: March 22, 2019
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Polarization-independent frequency conversion from the infrared into the ultraviolet
Applied Optics
|March 17, 2026
Summary
We demonstrate polarization-independent frequency conversion for quantum networks using sum frequency generation in a periodically poled lithium niobate crystal. This method bridges spectral gaps, enabling quantum node connectivity.
Area of Science:
- Quantum networking
- Nonlinear optics
- Quantum information science
Background:
- Quantum networks require connecting nodes operating at distinct wavelengths.
- Bridging large spectral gaps is crucial for quantum network connectivity.
- Nonlinear frequency conversion is a key technique for wavelength management.
Purpose of the Study:
- To demonstrate polarization-independent frequency conversion for quantum networking applications.
- To bridge spectral gaps between quantum nodes using sum frequency generation.
- To develop a robust method for wavelength conversion in quantum communication.
Main Methods:
- Utilized sum frequency generation (SFG) in a periodically poled lithium niobate (PPLN) crystal.
- Implemented a modified Sagnac interferometer for broad wavelength operation.
- Characterized conversion efficiency, spectral acceptance, and polarization preservation.
Main Results:
- Achieved polarization-independent frequency conversion from 863 nm to 370 nm.
- Demonstrated the effectiveness of the modified Sagnac interferometer setup.
- Quantified the system's performance in terms of key optical parameters.
Conclusions:
- The developed method enables efficient and polarization-independent frequency conversion for quantum networks.
- The Sagnac interferometer configuration provides a versatile platform for bridging spectral gaps.
- This work contributes to advancing the infrastructure for scalable quantum communication.
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