Room-temperature on-chip orbital angular momentum single-photon sources.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35020431.
- Also identified by DOI 10.1126/sciadv.abk3075 and PMC identifier 8754403.
- Licence recorded as CC BY-NC.
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Abstract
On-chip photon sources carrying orbital angular momentum (OAM) are in demand for high-capacity optical information processing in both classical and quantum regimes. However, currently exploited integrated OAM sources have been primarily limited to the classical regime. Here, we demonstrate a room-temperature on-chip integrated OAM source that emits well-collimated single photons, with a single-photon purity of <i>g</i><sup>(2)</sup>(0) ≈ 0.22, carrying entangled spin and OAM states and forming two spatially separated entangled radiation channels with different polarization properties. The OAM-encoded single photons are generated by efficiently outcoupling diverging surface plasmon polaritons excited with a deterministically positioned quantum emitter via Archimedean spiral gratings. Our OAM single-photon source platform bridges the gap between conventional OAM manipulation and nonclassical light sources, enabling high-dimensional and large-scale photonic quantum systems for quantum information processing.