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arXiv · 2402.16224

Multiplexed Entanglement of Multi-emitter Quantum Network Nodes

Andrei Ruskuc·Chun-Ju Wu·Emanuel Green·Sophie L. N. Hermans·Joonhee Choi·Andrei Faraon
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Abstract

Quantum networks that distribute entanglement among remote nodes will unlock transformational technologies in quantum computing, communication, and sensing. However, state-of-the-art networks utilize only a single optically-addressed qubit per node; this constrains both the quantum communication bandwidth and memory resources, greatly impeding scalability. Solid-state platforms provide a valuable resource for multiplexed quantum networking where multiple spectrally-distinguishable qubits can be hosted in nano-scale volumes. Here we harness this resource by implementing a two-node network consisting of several rare-earth ions coupled to nanophotonic cavities. This is accomplished with a protocol that entangles distinguishable 171Yb ions through frequency-erasing photon detection combined with real-time quantum feedforward. This method is robust to slow optical frequency fluctuations occurring on timescales longer than a single entanglement attempt: a universal challenge amongst solid-state emitters. We demonstrate the enhanced functionality of these multi-emitter nodes in two ways. First, we mitigate bottlenecks to the entanglement distribution rate through multiplexed entanglement of two remote ion pairs. Secondly, we prepare multipartite W-states comprising three distinguishable ions as a resource for advanced quantum networking protocols. These results lay the groundwork for scalable quantum networking based on rare-earth ions.

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Andrei Ruskuc, Chun-Ju Wu, Emanuel Green, Sophie L. N. Hermans, Joonhee Choi, Andrei Faraon. 2024-02-25. Multiplexed Entanglement of Multi-emitter Quantum Network Nodes. https://arxiv.org/abs/2402.16224

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