Multiplexed entanglement of multi-emitter quantum network nodes
成果类型：
Article
署名作者：
Ruskuc, A.; Wu, C. -j.; Green, E.; Hermans, S. L. N.; Pajak, W.; Choi, J.; Faraon, A.
署名单位：
California Institute of Technology; California Institute of Technology; California Institute of Technology; California Institute of Technology; Stanford University; Harvard University
刊物名称：
Nature
ISSN/ISSBN：
0028-3435
DOI：
10.1038/s41586-024-08537-z
发表日期：
2025-03-06
关键词：
heralded entanglement
spins
atoms
摘要：
Quantum networks that distribute entanglement among remote nodes will unlock transformational technologies in quantum computing, communication and sensing1, 2, 3-4. However, state-of-the-art networks5, 6, 7, 8, 9, 10, 11, 12, 13-14 use only a single optically addressed qubit per node; this constrains both the quantum communication bandwidth and memory resources, greatly impeding scalability. Solid-state platforms15, 16, 17, 18, 19, 20, 21, 22, 23-24 provide a valuable resource for multiplexed quantum networking in which 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 cavities25, 26, 27, 28, 29, 30-31. 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 the bottlenecks to the entanglement distribution rate through multiplexed entanglement of two remote ion pairs32,33. Second, we prepare multipartite W-states comprising three distinguishable ions as a resource for advanced quantum networking protocols34,35. These results lay the groundwork for scalable quantum networking based on rare-earth ions.