Entangling operations in a quantum repeater node using synchronized fast adiabatic pulses

doi:10.1088/1674-1056/add67e

中国物理B ›› 2025, Vol. 34 ›› Issue (10): 100304-100304.doi: 10.1088/1674-1056/add67e

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

收稿日期:2025-04-02 修回日期:2025-05-06 接受日期:2025-05-09 发布日期:2025-09-29
通讯作者: Tao Tu, Chuan-Feng Li E-mail:tutao@ustc.edu.cn;licf@ustc.edu.cn
基金资助:
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).

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

Received:2025-04-02 Revised:2025-05-06 Accepted:2025-05-09 Published:2025-09-29
Contact: Tao Tu, Chuan-Feng Li E-mail:tutao@ustc.edu.cn;licf@ustc.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: cavity QED, quantum information with hybrid systems, entanglement production

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.

Key words: cavity QED, quantum information with hybrid systems, entanglement production

中图分类号: (Quantum computation architectures and implementations)

03.67.Lx

42.50.Dv (Quantum state engineering and measurements) 42.50.Pq (Cavity quantum electrodynamics; micromasers)

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[J]. 中国物理B, 2025, 34(10): 100304-100304.

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Entangling operations in a quantum repeater node using synchronized fast adiabatic pulses

Entangling operations in a quantum repeater node using synchronized fast adiabatic pulses

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