A central challenge in quantum networking is transferring quantum states between different physical modalities, such as between flying photonic qubits and stationary quantum memories. One implementation entails using spin-photon interfaces that combine solid-state spin qubits, such as color centers in diamond, with photonic nanostructures. However, while high-fidelity spin-photon interactions have been demonstrated on isolated devices, building practical quantum repeaters requires scaling to large numbers of interfaces yet to be realized. Here, we demonstrate integration of nanophotonic cavities containing tin-vacancy (SnV) centers in a photonic integrated circuit (PIC). Out of a six-channel quantum micro-chiplet (QMC), we find four coupled SnV-cavity devices with an average Purcell factor of ~7. Based on system analyses and numerical simulations, we find with near-term improvements this multiplexed architecture can enable high-fidelity quantum state transfer, paving the way towards building large-scale quantum repeaters.
@article{arxiv.2402.18057,
title = {A scalable cavity-based spin-photon interface in a photonic integrated circuit},
author = {Kevin C. Chen and Ian Christen and Hamza Raniwala and Marco Colangelo and Lorenzo De Santis and Katia Shtyrkova and David Starling and Ryan Murphy and Linsen Li and Karl Berggren and P. Benjamin Dixon and Matthew Trusheim and Dirk Englund},
journal= {arXiv preprint arXiv:2402.18057},
year = {2024}
}