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Entangling operations in a quantum repeater node using synchronized fast adiabatic pulses |
| Hai-Ping Wan(万海平)1, Xing-Yu Zhu(朱行宇)1,2, Zhu-Cheng Yue(岳祝成)1, Tao Tu(涂涛)1,3,†, and Chuan-Feng Li(李传锋)1,3,‡ |
1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;
2 School of Mechanical and Electronic Engineering, Suzhou University, Suzhou 234000, China;
3 Hefei National Laboratory, Hefei 230088, China |
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Abstract Solid-state rare-earth ions are promising candidates for implementing repeater nodes for quantum networks. However, the state-of-the-art quantum nodes use only a single qubit per node, which greatly limits the functionality of the node and the scalability of the network. Here, we propose a scheme that utilizes a hybrid system of two ion qubits coupled to a nanophotonic cavity as a quantum node. Simultaneously applying a fast adiabatic pulse to the two ions can lead to an effective interaction between the two ion spin qubits by exchanging virtual photons in the cavity. Using this interaction, a controlled phase gate between the two ion qubits can be realized with a fidelity of 99.6%. Further utilizing this interaction, entangled states within the node can be generated deterministically with high fidelity, and are robust to a variety of noises and fluctuations. These results pave a way for fully functional quantum repeater nodes based on solid-state rare-earth ions.
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Received: 02 April 2025
Revised: 06 May 2025
Accepted manuscript online: 09 May 2025
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PACS:
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03.67.Lx
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(Quantum computation architectures and implementations)
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42.50.Dv
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(Quantum state engineering and measurements)
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42.50.Pq
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(Cavity quantum electrodynamics; micromasers)
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 12304401 and 12350006), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0301200), and USTC Research Funds of the Double First-Class Initiative (Grant No. YD2030002026). |
Corresponding Authors:
Tao Tu, Chuan-Feng Li
E-mail: tutao@ustc.edu.cn;licf@ustc.edu.cn
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Cite this article:
Hai-Ping Wan(万海平), Xing-Yu Zhu(朱行宇), Zhu-Cheng Yue(岳祝成), Tao Tu(涂涛), and Chuan-Feng Li(李传锋) Entangling operations in a quantum repeater node using synchronized fast adiabatic pulses 2025 Chin. Phys. B 34 100304
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