Metropolitan-scale ion-photon entanglement via a quantum network node with hybrid multiplexing enhancements.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41353254.
- Also identified by DOI 10.1038/s41467-025-67311-5 and PMC identifier 12820163.
- Licence recorded as CC BY-NC-ND.
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Abstract
Quantum network and quantum repeater are promising ways to scale up a quantum information system. In a functional quantum network, it is required that the distribution rate of heralded remote entanglement should be higher than the decoherence rate of each local node. A promising scheme to accelerate the remote entanglement distribution is through multiplexing enhancement. In this work, we experimentally realize a multiplexed quantum network node based on a chain of <sup>40</sup>Ca<sup>+</sup> ions. We employ a hybrid multiplexing scheme in which maximally 44 time-bin modes are generated and sent through a long fiber to boost the entangling rate. Via this scheme, we can generate heralded ion-photon entanglement with a success rate of 4.28 s<sup>-1</sup> over a 12 km fiber. In addition, a dual-type framework is utilized to protect quantum information from the destructive ion-photon entangling attempts and a memory coherence time of 366 ms is achieved, which has exceeded the entanglement generation time.