期刊
OPTICA
卷 9, 期 2, 页码 258-263出版社
Optica Publishing Group
DOI: 10.1364/OPTICA.440383
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类别
资金
- National Science Foundation [DMS 18-39177]
This study realizes quantum nanophotonic integrated circuits in thin-film InGaP with strong optical nonlinearity, including efficient second-harmonic generation and generation of a large number of photon pairs.
Optical nonlinearity plays a pivotal role in quantum information processing using photons, from heralded single-photon sources and coherent wavelength conversion to long-sought quantum repeaters. Despite the availability of strong dipole coupling to quantum emitters, achieving strong bulk optical nonlinearity is highly desirable. Here, we realize quantum nanophotonic integrated circuits in thin-film InGaP with, to our knowledge, a record-high ratio of 1.5% between the single-photon nonlinear coupling rate (g/2 pi = 11.2 MHz) and cavity-photon loss rate. We demonstrate second-harmonic generation with an efficiency of 71200 +/- 10300%/W in the InGaP photonic circuit and photon-pair generation via degenerate spontaneous parametric downconversion with an ultrahigh rate exceeding 27.5 MHz/mu W-an order of magnitude improvement of the state of the art-and a large coincidence-to-accidental ratio up to 1.4 x 10(4). Our work shows InGaP as a potentially transcending platform for quantum nonlinear optics and quantum information applications. (C) 2022 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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