Realization of a crosstalk-free two-ion node for long-distance quantum networking
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arXiv
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2024
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| author | Lai, P. -C. Wang, Y. Shi, J. -X. Cui, Z. -B. Wang, Z. -Q. Zhang, S. Liu, P. -Y. Tian, Z. -C. Sun, Y. -D. Chang, X. -Y. Qi, B. -X. Huang, Y. -Y. Zhou, Z. -C. Wu, Y. -K. Xu, Y. Pu, Y. -F. Duan, L. -M. |
| author_facet | Lai, P. -C. Wang, Y. Shi, J. -X. Cui, Z. -B. Wang, Z. -Q. Zhang, S. Liu, P. -Y. Tian, Z. -C. Sun, Y. -D. Chang, X. -Y. Qi, B. -X. Huang, Y. -Y. Zhou, Z. -C. Wu, Y. -K. Xu, Y. Pu, Y. -F. Duan, L. -M. |
| contents | 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 an 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_13369 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Realization of a crosstalk-free two-ion node for long-distance quantum networking Lai, P. -C. Wang, Y. Shi, J. -X. Cui, Z. -B. Wang, Z. -Q. Zhang, S. Liu, P. -Y. Tian, Z. -C. Sun, Y. -D. Chang, X. -Y. Qi, B. -X. Huang, Y. -Y. Zhou, Z. -C. Wu, Y. -K. Xu, Y. Pu, Y. -F. Duan, L. -M. Quantum Physics 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 an 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. |
| title | Realization of a crosstalk-free two-ion node for long-distance quantum networking |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2405.13369 |