Realization of a crosstalk-free multi-ion node for long-distance quantum networking

• URL: http://arxiv.org/abs/2405.13369v1
• Date: Wed, 22 May 2024 05:58:37 GMT
• Title: Realization of a crosstalk-free multi-ion node for long-distance quantum networking
• Authors: P. -C. Lai, Y. Wang, J. -X. Shi, Z. -B. Cui, Z. -Q. Wang, S. Zhang, P. -Y. Liu, Z. -C. Tian, Y. -D. Sun, X. -Y. Chang, B. -X. Qi, Y. -Y. Huang, Z. -C. Zhou, Y. -K. Wu, Y. Xu, Y. -F. Pu, L. -M. Duan,
• Abstract summary: Trapped atomic ions constitute one of the leading physical platforms for building the quantum repeater nodes. In a long-distance trapped-ion quantum network, it is essential to have crosstalk-free dual-type qubits. We report the first experimental implementation of a telecom-compatible and crosstalk-free quantum network node.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Trapped atomic ions constitute one of the leading physical platforms for building the quantum repeater nodes to realize large-scale quantum networks. In a long-distance trapped-ion quantum network, it is essential to have crosstalk-free dual-type qubits: one type, called the communication qubit, to establish entangling interface with telecom photons; and the other type, called the memory qubit, to store quantum information immune from photon scattering under entangling attempts. Here, we report the first experimental implementation of a telecom-compatible and crosstalk-free quantum network node based on two trapped $^{40}$Ca$^{+}$ ions. The memory qubit is encoded on a long-lived metastable level to avoid crosstalk with the communication qubit encoded in another subspace of the same ion species, and a quantum wavelength conversion module is employed to generate ion-photon entanglement over a $12\,$km fiber in a heralded style. Our work therefore constitutes an important step towards the realization of quantum repeaters and long-distance quantum networks.

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