Synthetic five-wave mixing in an integrated microcavity for visible-telecom entanglement generation

Jia-Qi Wang, Yuan-Hao Yang, Ming Li (), Haiqi Zhou, Xin-Biao Xu, Ji-Zhe Zhang, Chun-Hua Dong, Guang-Can Guo and C.-L. Zou ()
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Jia-Qi Wang: University of Science and Technology of China
Yuan-Hao Yang: University of Science and Technology of China
Ming Li: University of Science and Technology of China
Haiqi Zhou: University of Science and Technology of China
Xin-Biao Xu: University of Science and Technology of China
Ji-Zhe Zhang: University of Science and Technology of China
Chun-Hua Dong: University of Science and Technology of China
Guang-Can Guo: University of Science and Technology of China
C.-L. Zou: University of Science and Technology of China

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Nonlinear optics processes lie at the heart of photonics and quantum optics for their indispensable role in light sources and information processing. During the past decades, the three- and four-wave mixing (χ(2) and χ(3)) effects have been extensively studied, especially in the micro-/nano-structures by which the photon-photon interaction strength is greatly enhanced. So far, the high-order nonlinearity beyond the χ(3) has rarely been studied in dielectric materials due to their weak intrinsic nonlinear susceptibility, even in high-quality microcavities. Here, an effective five-wave mixing process (χ(4)) is synthesized by incorporating χ(2) and χ(3) processes in a single microcavity. The coherence of the synthetic χ(4) is verified by generating time-energy entangled visible-telecom photon pairs, which requires only one drive laser at the telecom waveband. The photon-pair generation rate from the synthetic process shows an estimated enhancement factor over 500 times upon intrinsic five-wave mixing. Our work demonstrates a universal approach of nonlinear synthesis via photonic structure engineering at the mesoscopic scale rather than material engineering, and thus opens a new avenue for realizing high-order optical nonlinearities and exploring functional photonic devices.

Date: 2022
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DOI: 10.1038/s41467-022-33914-5

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