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Quantum photonic integrated circuit (QPIC) is a promising tool forconstructing integrated devices for quantum technology applications. In theoptical regime, silicon photonics empowered bycomplementary-metal-oxide-semiconductor (CMOS) technology provides opticalcomponents useful for realizing large-scale QPICs. Optical nonlinearity at thesingle-photon level is required for QPIC to facilitate photon-photoninteraction. However, to date, realization of optical elements withdeterministic( i.e., not probabilistic) single-photon nonlinearity by usingsilicon-based components is challenging, despite the enhancement of thefunctionality of QPICs based on silicon photonics. In this study, we realizefor the first time a strongly coupled InAs/GaAs quantum dot-cavity quantumelectrodynamics (QED) system on a CMOS-processed silicon photonic chip. Theheterogeneous integration of the GaAs cavity on the silicon chip is performedby transfer printing. The cavity QED system on the CMOS photonic chip realizedin this work is a promising candidate for on-chip single-photon nonlinearelement, which constitutes the fundamental component for future applicationsbased on QPIC, such as, coherent manipulation and nondestructive measurement ofqubit states via a cavity, and efficient single-photon filter and router.

Strongly coupled single quantum dot-cavity system integrated on a CMOS-processed silicon photonic chip