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  • Realization of a crosstalk-...
    Feng, L; Huang, Y-Y; Wu, Y-K; Guo, W-X; Ma, J-Y; Yang, H-X; Zhang, L; Wang, Y; Huang, C-X; Zhang, C; Yao, L; Qi, B-X; Pu, Y-F; Zhou, Z-C; Duan, L-M

    Nature communications, 01/2024, Volume: 15, Issue: 1
    Journal Article

    Generating ion-photon entanglement is a crucial step for scalable trapped-ion quantum networks. To avoid the crosstalk on memory qubits carrying quantum information, it is common to use a different ion species for ion-photon entanglement generation such that the scattered photons are far off-resonant for the memory qubits. However, such a dual-species scheme can be subject to inefficient sympathetic cooling due to the mass mismatch of the ions. Here we demonstrate a trapped-ion quantum network node in the dual-type qubit scheme where two types of qubits are encoded in the S and F hyperfine structure levels of Yb ions. We generate ion photon entanglement for the S-qubit in a typical timescale of hundreds of milliseconds, and verify its small crosstalk on a nearby F-qubit with coherence time above seconds. Our work demonstrates an enabling function of the dual-type qubit scheme for scalable quantum networks.