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

Holzgrafe, Jeffrey and Sinclair, Neil and Zhu, Di and Shams-Ansari, Amirhassan and Colangelo, Marco and Hu, Yaowen and Zhang, Mian and Berggren, Karl K. and Lončar, Marko (2020) Cavity electro-optics in thin-film lithium niobate for efficient microwave-to-optical transduction. . (Unpublished)

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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 2.7×10⁻⁵, and a pump-power normalized efficiency of 1.9×10⁻⁶/μW. 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.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Shams-Ansari, Amirhassan0000-0002-2165-7832
Zhang, Mian0000-0001-9838-3895
Lončar, Marko0000-0002-5029-5017
Additional Information:This work was performed in part at the Center for Nanoscale Systems (CNS), a member of the National Nanotechnology Coordinated Infrastructure Network (NNCI), which is supported by the National Science Foundation under NSF award no. 1541959. CNS is part of Harvard University. D.Z. is supported by the Harvard Quantum Initiative (HQI) postdoctoral fellowship. The authors thank C.J. Xin, E. Puma, B. Machielse, C. Wang, Y. Qiu, and W. Oliver for helpful discussions and assistance with device fabrication.
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Harvard UniversityUNSPECIFIED
Record Number:CaltechAUTHORS:20200923-152422599
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105511
Deposited By: Tony Diaz
Deposited On:23 Sep 2020 22:35
Last Modified:23 Sep 2020 22:35

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