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arXiv · 2607.12002

Remote Entanglement of Solid-State Spin Qubits Integrated in Broadband Waveguides

Christopher Waas·Timo Dolné·Hans K. C. Beukers·Alexander M. Stramma·Nina Codreanu·Noé Mathieu·Ronald Hanson
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Abstract

Solid-state spin-photon interfaces promise to scale quantum networks through on-chip photonic integration and multiplexed entanglement generation. To date, remote entanglement between integrated emitters has been realized only in cavity-enhanced systems, where fabrication yield and spectral matching remain major obstacles. Here we demonstrate heralded remote entanglement between diamond tin-vacancy spin qubits embedded in separate on-chip waveguides. Combining intrinsically efficient photon emission with a broadband waveguide architecture provides high device yield and obviates the need for spectral matching to cavity modes. We realize coherent optical and spin control and achieve high-visibility two-photon interference. By combining photon-mediated entanglement generation with real-time feedforward, we produce a consistent entangled state independent of the heralding pattern. These results establish waveguide-integrated tin-vacancy centers as a compelling platform for scalable quantum network nodes.

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Christopher Waas, Timo Dolné, Hans K. C. Beukers, Alexander M. Stramma, Nina Codreanu, Noé Mathieu, Ronald Hanson. 2026-07-13. Remote Entanglement of Solid-State Spin Qubits Integrated in Broadband Waveguides. https://arxiv.org/abs/2607.12002

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