LNOI Wafer + Quantum--Integrated Sub-Terahertz Cavity Electro-Optic Transduction

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Integrated Sub-Terahertz Cavity Electro-Optic Transduction.pdf

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 SAW surface acoustic wave device--POI wafer 

 TFLN PIC thin film lithium niobate photonic integrated circuit--LNOI wafer 

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 * Ion implantation * Thinning and polishing * Surface activation bonding * Hydrophilic bonding * Annealing * Ultra-high precision TRIM polishing Comprehensive processing capabilities can provide you with fast and efficient customized processing services.

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This article presents the development of an integrated electro-optic transducer operating in the sub-terahertz (sub-THz) frequency range, designed to bridge the gap between classical and quantum systems. The transducer combines a superconducting niobium titanium nitride (NbTiN) resonator at 107 GHz with a thin-film lithium niobate (TFLN) optical cavity to facilitate sub-THz to optical conversion.

Key findings include the achievement of photon transduction efficiency of approximately 0.82×10⁻⁶ and a single-photon electro-optic coupling rate of 0.7 kHz. The device leverages a triply-resonant electro-optic system where sub-THz signals modulate the refractive index of the TFLN, creating sidebands through three-wave mixing. The authors also address the challenges associated with integrated sub-THz resonators, such as parasitic modes from the sapphire substrate, and propose solutions to mitigate these effects.

The study also provides a detailed analysis of the device’s operation, including cryogenic optical and sub-THz cavity spectroscopy, and the characterization of the transduction efficiency as a function of optical and RF photon numbers. The results show a linear relationship between transduction efficiency and intracavity optical photon number, with some nonlinear effects attributed to local heating of the sub-THz resonator.

This work paves the way for future advancements in sub-THz quantum technologies by enabling high-efficiency electro-optic transduction and improving the integration of quantum devices across different frequency ranges.