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Room-temperature on-chip orbital angular momentum single-photon sources.
Cuo Wu1,2, Shailesh Kumar2, Yinhui Kan2,3
1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China.
Science Advances
|January 12, 2022
Summary
We developed a new on-chip source for single photons carrying orbital angular momentum (OAM). This integrated quantum light source enables high-dimensional quantum information processing.
Area of Science:
- Quantum optics
- Integrated photonics
- Nanophotonics
Background:
- On-chip photon sources with orbital angular momentum (OAM) are crucial for advanced optical information processing.
- Existing integrated OAM sources are mainly limited to classical applications.
Purpose of the Study:
- To demonstrate a room-temperature, on-chip integrated source of single photons carrying entangled spin and OAM states.
- To enable high-dimensional and large-scale photonic quantum systems.
Main Methods:
- Excitation of surface plasmon polaritons using a quantum emitter.
- Efficient outcoupling of OAM-encoded single photons via Archimedean spiral gratings.
- Deterministic positioning of the quantum emitter for precise OAM generation.
Main Results:
- Demonstration of a room-temperature on-chip OAM single-photon source.
- Achieved single-photon purity of g(2)(0) ≈ 0.22.
- Generated two spatially separated entangled radiation channels with distinct polarization properties.
Conclusions:
- The developed platform bridges the gap between classical OAM manipulation and nonclassical light sources.
- This work paves the way for high-capacity quantum information processing using integrated OAM photons.
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