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Optically active solid-state spin qubits thrive as an appealing technologyfor quantum interconnect and quantum networking, owing to their atomic size,scalable creation, long-lived coherence, and ability to coherently interfacewith flying qubits. Trivalent erbium dopants in particular emerge as acompelling candidate with their telecom C band emission and shielded 4fintra-shell spin-optical transitions. However, prevailing top-down architecturefor rare-earth qubits and devices has not allowed simultaneous long optical andspin coherence necessary for long-distance quantum networks. Here wedemonstrate dual erbium telecom spin-photon interfaces in an epitaxialthin-film platform via wafer-scale bottom-up synthesis. Harnessing precisecontrols over the matrix purity, dopant placement, and symmetry unique to thisplatform, we simultaneously achieve millisecond erbium spin coherence time and$<$3 kilohertz optical dephasing rate in an inversion-symmetry protected siteand realize both optical and microwave control in a fiber-integrated packagefor rapid scaling up. These results demonstrate a significant prospect forhigh-quality rare-earth qubits and quantum memories assembled using a bottom-upmethod and pave the way for the large-scale development of quantum light-matterinterfaces for telecommunication quantum networks.

Dual epitaxial telecom spin-photon interfaces with correlated long-lived coherence