Fast photon-mediated entanglement of continuously-cooled trapped ions for quantum networking

Abstract

We entangle two co-trapped atomic barium ion qubits by collecting single visible photons from each ion through in-vacuo 0.8 NA objectives, interfering them through an integrated fiber-beamsplitter and detecting them in coincidence. This projects the qubits into an entangled Bell state with an observed fidelity lower bound of F > 94%. We also introduce an ytterbium ion for sympathetic cooling to remove the need for recooling interruptions and achieve a continuous entanglement rate of 250 1/s.

8 pages, 5 figures

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• Quantum Internet: Resource Estimation for Entanglement Routing
• Compatibility of trapped ions and dielectrics at cryogenic temperatures
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• Kilometer-Scale Ion-Photon Entanglement with a Metastable ${}^{88}$Sr${}^{+}$ Qubit
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