2026-10-13T02:45:10Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34046820 2026-10-01T16:00:42Z category_37476 portal_1023 item_type_12 month_year_10_2026

Single-Photon Nonlinearity from a Nanobeam with a Quantum Dot Abhijit Biswas (2031100) Neelesh Kumar Vij (17282785) Allan S. Bracker (7203653) Margaret Stevens (8654241) Joel Q. Grim (5869991) Edo Waks (1639996) Physics (arXiv) physics.optics (arXiv) quant-ph (arXiv) An efficient single-photon nonlinearity is a key resource for photonic quantum technologies. Single-photon nonlinearities have been demonstrated with quantum dots (QDs) across a range of cavity and waveguide geometries. However, none of these realizations simultaneously provide high-efficiency direct fiber coupling and compatibility with scalable on-chip integration. The nanobeam cavity addresses these limitations through its in-plane geometry, which enables highly efficient, direct fiber coupling alongside scalable homogeneous and heterogeneous on-chip integration. Here, we report a single-photon nonlinearity from a nanobeam cavity coupled to a single quantum dot. The nanobeam interfaces directly with a single-mode fiber with an efficiency of 60%. Driven by resonant picosecond pulses, the platform achieves a single-photon nonlinearity with a low threshold of 0.24 incident photons per pulse. The system operates in the strong-coupling regime, exhibiting a coupling rate of g/2π = 29.1 GHz and a cooperativity of C = 3.98. These results establish the nanobeam cavity-QD system as a compact, chip-integrable, and fiber-compatible building block for scalable photonic quantum technologies. 2026-09-29T00:00:00Z Text Preprint 10.48550/arXiv.2609.36658 https://figshare.com/articles/preprint/Single-Photon_Nonlinearity_from_a_Nanobeam_with_a_Quantum_Dot/34046820 CC0