Efficient Photonic Integration of Diamond Color Centers and Thin-Film Lithium Niobate

On-chip photonic quantum circuits with integrated quantum memories have the potential to radically advance hardware for quantum information processing. In particular, negatively charged group-IV color centers in diamond are promising candidates for quantum memories as they combine long storage times...

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Bibliographic Details
Published inACS photonics Vol. 10; no. 12; pp. 4236 - 4243
Main Authors Riedel, Daniel, Lee, Hope, Herrmann, Jason F., Grzesik, Jakob, Ansari, Vahid, Borit, Jean-Michel, Stokowski, Hubert S., Aghaeimeibodi, Shahriar, Lu, Haiyu, McQuade, Patrick J., Melosh, Nicholas A., Shen, Zhi-Xun, Safavi-Naeini, Amir H., Vučković, Jelena
Format Journal Article
LanguageEnglish
Published American Chemical Society 20.12.2023
Subjects
thin-film lithium niobate
silicon-vacancy center
diamond
color centers
quantum photonics
heterogeneous integration
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Summary:On-chip photonic quantum circuits with integrated quantum memories have the potential to radically advance hardware for quantum information processing. In particular, negatively charged group-IV color centers in diamond are promising candidates for quantum memories as they combine long storage times with excellent optical emission properties and an optically addressable spin state. However, as a material, diamond lacks the many functionalities needed to realize scalable quantum systems. Thin-film lithium niobate (TFLN), in contrast, offers a number of useful photonic nonlinearities, including the electro-optic effect, piezoelectricity, and capabilities for periodically poled quasi-phase matching. Here, we present the highly efficient heterogeneous integration of diamond nanobeams containing negatively charged silicon-vacancy (SiV) centers with TFLN waveguides. We observe greater than 90% transmission efficiency between the diamond nanobeam and the TFLN waveguide on average across multiple measurements. By comparing saturation signal levels between confocal and integrated collection, we estimate a more than 10-fold increase in photon emission channeled into TFLN waveguides versus that channeled into out-of-plane collection channels. Our results constitute a key step for creating scalable integrated quantum photonic circuits that leverage the advantages of both diamond and TFLN materials.
ISSN:2330-4022
2330-4022
DOI:10.1021/acsphotonics.3c00992