{"paper":{"title":"High-Efficiency InGaP-on-Insulator Microresonator Nonlinear Conversion and Entanglement Generation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Surface treatment reduces loss in InGaP-on-insulator microresonators to deliver 3.01×10^5 %/W second-harmonic generation and 11.7 MHz/μW photon-pair rates.","cross_cats":[],"primary_cat":"physics.app-ph","authors_text":"Amalu Shimamura, Galan Moody, John Bowers, Joshua Castro, Kevin Silverman, Lillian Thiel, Lucas Wang, Max Meunier, Nicholas Lewis, Richard Mirin, Xuefeng Li, Yiming Pang","submitted_at":"2026-05-14T23:50:06Z","abstract_excerpt":"InGaP-on-insulator, with its intrinsically high $\\chi^{(2)}$ optical nonlinearity, has emerged as an efficient and bright integrated photonic platform for frequency conversion and on-chip entanglement generation, but high waveguide propagation loss in the visible wavelength range has limited its overall performance. Here, we identify the dominant loss mechanism through mode-profile analysis and effectively mitigate the loss using a surface treatment method. Statistical analysis of the resonator quality factor and propagation loss reveals the optimal ring radius that maintains a strong nonlinea"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The surface treatment method provides a 3.5--4× linear performance enhancement, enabling a second-harmonic generation efficiency of 3.01×10^5 %/W and a photon-pair generation rate of 11.7 MHz/μW with coincidence-to-accidental ratio as high as 10,000.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The dominant loss mechanism identified via mode-profile analysis is the primary contributor and is effectively mitigated by the surface treatment without introducing compensating losses or degrading the intrinsic nonlinearity, and the statistical analysis of quality factor versus radius correctly identifies the optimal geometry for balancing nonlinear interaction strength against bending 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