DOE OSTI · 3363825
Thin-film lithium niobate on diamond as a platform for efficient spin-phonon coupling
Abstract
Negatively charged silicon vacancy (SiV − ) centers in diamond are leading candidates for solid-state quantum memory that can be controlled using electromagnetic or acoustic waves. The latter are particularly promising due to the strong strain response of SiV − , enabling large spin-phonon interaction strengths. Indeed, coherent spin control via surface acoustic waves (SAWs) has been demonstrated and is essential for developing on-chip phononic quantum networks. However, the absence of piezoelectricity in diamond requires an interface with a piezoelectric material for efficient transduction and delivery of acoustic waves to spins in diamonds. Here, we demonstrate a heterogeneously integrated phononic platform that combines thin-film lithium niobate with diamond to enable acoustic control of single SiV − spins. Additionally, leveraging large SAW-induced strain at the location of SiV − , we achieve coherent acoustic control of an electron spin with more than twofold improvement in Rabi frequency compared to state-of-the-art devices based on aluminum nitride on diamond. Furthermore, this work represents a crucial step towards realizing phonon-based quantum information processing systems.
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Xu, Zhujing [Harvard University, Cambridge, MA (United States)], Ding, Sophie Weiyi [Harvard University, Cambridge, MA (United States); AWS Center for Quantum Computing, San Francisco, CA (United States)], Cornell, Eliza [Harvard University, Cambridge, MA (United States)] (ORCID:0009000713118744), Mohideen, Salma [Harvard University, Cambridge, MA (United States); Stanford University, CA (United States)] (ORCID:000900096384858X), Yeh, Matthew [Harvard University, Cambridge, MA (United States)], Kuruma, Kazuhiro [Harvard University, Cambridge, MA (United States); The University of Tokyo (Japan)] (ORCID:0000000208300230), Magalhaes, Leticia [Harvard University, Cambridge, MA (United States)] (ORCID:0000000270235724), Shams-Ansari, Amirhassan [Harvard University, Cambridge, MA (United States); DRS Daylight Solutions, San Diego, CA (United States)], Pingault, Benjamin [Argonne National Laboratory (ANL), Argonne, IL (United States); University of Chicago, IL (United States)] (ORCID:0000000312592747), Lončar, Marko [Harvard University, Cambridge, MA (United States)]. 2026-01-12. Thin-film lithium niobate on diamond as a platform for efficient spin-phonon coupling. https://doi.org/10.1103/cpgp-9jpx
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