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Spectrally separable photon-pair generation in dispersion engineered thin-film lithium niobate
Optics Letters
|June 1, 2022
Summary
Researchers developed a new method for creating pure, heralded single-photon sources using thin-film lithium niobate. This breakthrough addresses scalability issues for quantum networks and achieves high spectral purity.
Area of Science:
- Quantum optics
- Materials science
Background:
- Current heralded single-photon sources lack scalability for integrated quantum networks.
- Lithium niobate's material dispersion limits its use in photonics.
Purpose of the Study:
- To engineer dispersion and quasi-phasematching in thin-film lithium niobate waveguides.
- To generate spectrally pure photon pairs for quantum networks.
Main Methods:
- Waveguide engineering on the thin-film lithium niobate platform.
- Dispersion and quasi-phasematching condition optimization.
- Joint spectral intensity and phase-sensitive measurements.
Main Results:
- Generation of spectrally separable photon pairs in the telecommunications band.
- Estimated heralded-state spectral purity exceeding 94%.
- Measured heralded-state purity of (86±5)%.
Conclusions:
- Thin-film lithium niobate is a viable platform for scalable, high-purity heralded single-photon sources.
- Engineered dispersion and quasi-phasematching overcome previous limitations.
- The developed sources are suitable for advanced quantum network applications.
