有望な組み合わせ:科学者が量子科学のための新しい材料の組み合わせを実証(A promising pairing: Scientists demonstrate new combination of materials for quantum science)

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2023-12-14 アルゴンヌ国立研究所(ANL)

◆科学者は、ダイヤモンドとリチウムナイオブ酸塩を組み合わせた新しい量子デバイスを成功裏に開発し、その光伝送効率を92%まで向上させました。ダイヤモンドの優れた特性とリチウムナイオブ酸塩の柔軟性を組み合わせ、単一のチップ上での効率的な量子通信を実現しました。
◆この成果は、アメリカエネルギー省のQ-NEXTセンターによって支援されました。ダイヤモンドとリチウムナイオブ酸塩の組み合わせは、量子通信ネットワークや量子計算機の信頼性向上に寄与する可能性があり、今後の量子技術の進展に期待が寄せられています。

<関連情報>

ダイヤモンドカラーセンターと薄膜ニオブ酸リチウムの効率的なフォトニック集積化 Efficient Photonic Integration of Diamond Color Centers and Thin-Film Lithium Niobate

Daniel Riedel, Hope Lee, Jason F. Herrmann, Jakob Grzesik, Vahid Ansari, Jean-Michel Borit, Hubert S. Stokowski, Shahriar Aghaeimeibodi, Haiyu Lu, Patrick J. McQuade, Nicholas A. Melosh, Zhi-Xun Shen, Amir H. Safavi-Naeini, and Jelena Vučković
ACS Photonics  Published:December 4, 2023
DOI:https://doi.org/10.1021/acsphotonics.3c00992

Abstract

有望な組み合わせ:科学者が量子科学のための新しい材料の組み合わせを実証(A promising pairing: Scientists demonstrate new combination of materials for quantum science)

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.

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