Realization of a crosstalk-avoided quantum network node using dual-type qubits of the same ion species

L. Feng, Y.-Y. Huang, Y.-K. Wu, W.-X. Guo, J.-Y. Ma, H.-X. Yang, L. Zhang, Y. Wang, C.-X. Huang, C. Zhang, L. Yao, B.-X. Qi, Y.-F. Pu, Z.-C. Zhou and L.-M. Duan ()
Additional contact information
L. Feng: Tsinghua University
Y.-Y. Huang: Tsinghua University
Y.-K. Wu: Tsinghua University
W.-X. Guo: Tsinghua University
J.-Y. Ma: Tsinghua University
H.-X. Yang: HYQ Co. Ltd.
L. Zhang: Tsinghua University
Y. Wang: Tsinghua University
C.-X. Huang: Tsinghua University
C. Zhang: Tsinghua University
L. Yao: HYQ Co. Ltd.
B.-X. Qi: Tsinghua University
Y.-F. Pu: Tsinghua University
Z.-C. Zhou: Tsinghua University
L.-M. Duan: Tsinghua University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract 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 171Yb+ 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.

Date: 2024
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DOI: 10.1038/s41467-023-44220-z

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