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On-chip photon-pair generation in a silica microtoroidal cavity

洋輔 橋本, 晃久 碁盤, 裕貴 平林, 雄太 小林, 智宏 荒木, 隆朗 青木, Yosuke Hashimoto, Akihisa Goban, Yuki Hirabayashi, Yuta Kobayashi, Tomohiro Araki, Takao Aoki

Published Jan 21, 2021• 0 citations
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Optics Express•Oct 26, 2018•3 citations
Microcavities with high Q factor and small mode volume have the potential to be efficient and compact sources of photon pairs. Here, we demonstrate on-chip photon-pair generation by spontaneous four-wave mixing in a silica microtoroidal cavity and obtain a coincidence-to-accidental ratio of 7.4 ± 0.1 with a pump power of 46 µW. The heralded photons also exhibit antibunching characterized by autocorrelation function values of g c ( 2 ) ( 0 ) = 0.57 ± 0.03 < 1 . Comparing with a scaling model, the main noise source is found to be spontaneous Raman scattering in the cavity. This work opens a new possible means for realizing integrated nonclassical photon sources based on silica photonic circuits toward scalable quantum technologies.
We report two-photon interferences on a silica-on-silicon chip of Mach-Zehnder interferometer using telecommunication-band correlated photon pairs. The photon pairs were generated by spontaneous four-waving mixing process in a dispersion-shifted fiber. The integrated chip, which was fabricated by standard silica-on-silicon planar lightwave circuit technology, contained a Mach-Zehnder interferometer with a thermo-optic phase shifter. The insertion loss of the interferometer was less than 1 dB. We demonstrated two-photon interferences with both degenerate- and non-degenerate-frequency photon pairs on the Mach-Zehnder interferometer chip. A high fringe visibility was achieved in the interference with nondegenerate-frequency photons. Properties of quantum interference were demonstrated in the interference with degenerate-frequency photon pairs, which is an important way to manipulate the quantum state. These results show great potential of silica-on-silicon photonic chips in applications for the fiber-chip scheme in quantum networks.