Related papers: Cavity electro-optics in thin-film lithium niobate for efficient microwave-to-optical transduction

Cavity electro-optics in thin-film lithium niobate for efficient microwave-to-optical transduction

URL: http://arxiv.org/abs/2005.00939v2
Date: Tue, 12 May 2020 00:39:09 GMT
Title: Cavity electro-optics in thin-film lithium niobate for efficient microwave-to-optical transduction
Authors: Jeffrey Holzgrafe, Neil Sinclair, Di Zhu, Amirhassan Shams-Ansari, Marco Colangelo, Yaowen Hu, Mian Zhang, Karl K. Berggren, Marko Lon\v{c}ar
Abstract summary: We create an EO transducer in thin-film lithium niobate, leveraging the low optical loss and strong EO coupling. We demonstrate a transduction efficiency of up to $2.7times10-5$, and a pump-power normalized efficiency of $1.9times10-6/mathrmmu W$.
Score: 0.9485862597874625
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Linking superconducting quantum devices to optical fibers via microwave-optical quantum transducers may enable large scale quantum networks. For this application, transducers based on the Pockels electro-optic (EO) effect are promising for their direct conversion mechanism, high bandwidth, and potential for low-noise operation. However, previously demonstrated EO transducers require large optical pump power to overcome weak EO coupling and reach high efficiency. Here, we create an EO transducer in thin-film lithium niobate, leveraging the low optical loss and strong EO coupling in this platform. We demonstrate a transduction efficiency of up to $2.7\times10^{-5}$, and a pump-power normalized efficiency of $1.9\times10^{-6}/\mathrm{\mu W}$. The transduction efficiency can be improved by further reducing the microwave resonator's piezoelectric coupling to acoustic modes, increasing the optical resonator quality factor to previously demonstrated levels, and changing the electrode geometry for enhanced EO coupling. We expect that with further development, EO transducers in thin-film lithium niobate can achieve near-unity efficiency with low optical pump power.

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