Kavli Affiliate: Andrei Faraon
| First 5 Authors: Andrei Ruskuc, Andrei Ruskuc, , ,
| Summary:
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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