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Trapped ions form an advanced technology platform for quantum informationprocessing with long qubit coherence times, high-fidelity quantum logic gates,optically active qubits, and a potential to scale up in size while preserving ahigh level of connectivity between qubits. These traits make them attractivenot only for quantum computing but also for quantum networking. Dedicated,special-purpose trapped-ion processors in conjunction with suitableinterconnecting hardware can be used to form quantum repeaters that enablehigh-rate quantum communications between distant trapped-ion quantum computersin a network. In this regard, hybrid traps with two distinct species of ions,where one ion species can generate ion-photon entanglement that is useful foroptically interfacing with the network and the other has long memory lifetimes,useful for qubit storage, have been proposed for entanglement distribution. Weconsider an architecture for a repeater based on such dual-species trapped-ionsystems. We propose and analyze a protocol based on spatial and temporal modemultiplexing for entanglement distribution across a line network of suchrepeaters. Our protocol offers enhanced rates compared to rates previouslyreported for such repeaters. We determine the ion resources required at therepeaters to attain the enhanced rates, and the best rates attainable whenconstraints are placed on the number of repeaters and the number of ions perrepeater. Our results bolster the case for near-term trapped-ion systems asquantum repeaters for long-distance quantum communications.

Multiplexed quantum repeaters based on dual-species trapped-ion systems