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

• URL: http://arxiv.org/abs/2607.12002v1
• Date: Mon, 13 Jul 2026 18:00:00 GMT
• Title: Remote Entanglement of Solid-State Spin Qubits Integrated in Broadband Waveguides
• Abstract summary: We demonstrate remote entanglement between diamond tin-vacancy spin qubits embedded in separate on-chip waveguides.<n>We realize coherent optical and spin control and achieve high-visibility two-photon interference.<n>These results establish waveguide-integrated tin-vacancy centers as a compelling platform for scalable quantum network nodes.
• Score: 33.72751145910978
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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