InGaP quantum nanophotonic integrated circuits with 1.5%
nonlinearity-to-loss ratio
- URL: http://arxiv.org/abs/2105.12705v4
- Date: Tue, 25 Jan 2022 20:17:39 GMT
- Title: InGaP quantum nanophotonic integrated circuits with 1.5%
nonlinearity-to-loss ratio
- Authors: Mengdi Zhao and Kejie Fang
- Abstract summary: We realize quantum nanophotonic integrated circuits in thin-film InGaP with a record-high ratio of $1.5%$ between the single-photon nonlinear coupling rate and cavity-photon loss rate.
Our work shows InGaP as a potentially transcending platform for quantum nonlinear optics and quantum information applications.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Optical nonlinearity plays a pivotal role in quantum information processing
using photons, from heralded single-photon sources, 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 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
$71200\pm10300\%$/W in the InGaP photonic circuit and photon-pair generation
via degenerate spontaneous parametric down-conversion 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
$1.4\times 10^4$. Our work shows InGaP as a potentially transcending platform
for quantum nonlinear optics and quantum information applications.
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