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Efficient and low-noise single-photon-level frequency conversion interfaces using silicon nanophotonics
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Efficient and low-noise single-photon-level frequency conversion interfaces using silicon nanophotonics
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Journal Article
Efficient and low-noise single-photon-level frequency conversion interfaces using silicon nanophotonics
2016
Overview
Optical frequency conversion has applications ranging from tunable light sources to telecommunications-band interfaces for quantum information science. Here, we demonstrate efficient, low-noise frequency conversion on a nanophotonic chip through four-wave-mixing Bragg scattering in compact (footprint <0.5 × 10
–4
cm
2
) Si
3
N
4
microring resonators. We investigate three frequency conversion configurations: spectral translation over a few nanometres within the 980 nm band; upconversion from 1,550 nm to 980 nm; and downconversion from 980 nm to 1,550 nm. With conversion efficiencies ranging from 25% for the first process to >60% for the last two processes, a signal conversion bandwidth of >1 GHz, a required continuous-wave pump power of <60 mW and background noise levels between a few femtowatts and a few picowatts, these devices are suitable for quantum frequency conversion of single-photon states from InAs/GaAs quantum dots. Simulations based on coupled mode equations and the Lugiato–Lefever equation are used to model device performance, and show quantitative agreement with measurements.
Ultralow-noise frequency conversion within the 980-nm band and between the 980-nm and 1,550-nm bands occurs through Bragg scattering in Si
3
N
4
microring resonators. The maximum conversion efficiencies are 25% and 60%, respectively.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
