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arXiv · 2606.12726

Stable, bidirectional electro-optic transduction in thin film lithium tantalate

Christopher J. Axline·Stephan Gamper·Phoebe M. Tengdin·Moritz Businger·Guilhem Alma·Marina A. Roquet·Nicola Brusadin·Robin Giroud·Luis G. Villanueva
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Abstract

Efficient and stable microwave-optical transduction is a key enabling technology for distributed superconducting quantum computing and heterogeneous quantum networks. Electro-optic transducers based on thin-film lithium niobate (TFLN) have shown strong promise, but demonstrations to date have been limited by various factors such as low frequency bias drift, low efficiency, fabrication complexity, and scalability. Here we demonstrate the first integrated electro-optic microwave-optical transducers realized in thin-film lithium tantalate (TFLT), a material platform offering Pockels nonlinearity comparable to TFLN together with improved bias stability and high-power handling. We fabricate superconducting microwave resonators coupled to tunable photonic-molecule optical resonators using wafer-scale deep ultraviolet lithography, offering high-throughput production of hundreds of devices per wafer. Across six devices we observe coherent bidirectional conversion between C-band optical photons and 4.9-5.5 GHz microwave photons, with measured on-chip efficiencies and inferred single-photon coupling rates g_0/2{\pi} ~ 1 kHz consistent with theory. Continuous operation over multiple days is achieved using a static bias field with minimal feedback, demonstrating a major operational advantage. We further characterize optical loss statistics, microwave resonator performance, and optically induced added noise under pulsed pumping, finding less than one added photon for 100 microsecond pulses at the highest measured efficiencies. These results establish TFLT as a scalable and robust electro-optic platform for future quantum interconnects and modular quantum processors.

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Christopher J. Axline, Stephan Gamper, Phoebe M. Tengdin, Moritz Businger, Guilhem Alma, Marina A. Roquet, Nicola Brusadin, Robin Giroud, Luis G. Villanueva. 2026-06-10. Stable, bidirectional electro-optic transduction in thin film lithium tantalate. https://arxiv.org/abs/2606.12726

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