Entanglement properties of superconducting qubits coupled to a semi-infinite transmission line

doi:10.1088/1674-1056/acc0fa

中国物理B ›› 2023, Vol. 32 ›› Issue (6): 60302-060302.doi: 10.1088/1674-1056/acc0fa

Entanglement properties of superconducting qubits coupled to a semi-infinite transmission line

Yang-Qing Guo(郭羊青)¹, Ping-Xing Chen(陈平形)¹, and Jian Li(李剑)^2,3,4,†

1 Department of Physics, National University of Defense Technology, Changsha 410073, China;
2 Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
3 International Quantum Academy, Shenzhen 518048, China;
4 Guangdong Provincial Key Laboratory of Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China

收稿日期:2023-01-18 修回日期:2023-03-02 接受日期:2023-03-03 出版日期:2023-05-17 发布日期:2023-06-26
通讯作者: Jian Li E-mail:lij33@sustech.edu.cn
基金资助:
Project supported by the Key-Area Research and Development Program of Guangdong Province of China (Grant No. 2018B030326001), the National Natural Science Foundation of China (Grant No. 11874065), the Guangdong Provincial Key Laboratory (Grant No. 2019B121203002), the Science, Technology and Innovation Commission of Shenzhen Municipality (Grant No. KYTDPT20181011104202253), and the Shenzhen Hong Kong Cooperation Zone for Technology and Innovation of China (Grant No. HZQB-KCZYB-2020050).

Entanglement properties of superconducting qubits coupled to a semi-infinite transmission line

Yang-Qing Guo(郭羊青)¹, Ping-Xing Chen(陈平形)¹, and Jian Li(李剑)^2,3,4,†

1 Department of Physics, National University of Defense Technology, Changsha 410073, China;
2 Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
3 International Quantum Academy, Shenzhen 518048, China;
4 Guangdong Provincial Key Laboratory of Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China

Received:2023-01-18 Revised:2023-03-02 Accepted:2023-03-03 Online:2023-05-17 Published:2023-06-26
Contact: Jian Li E-mail:lij33@sustech.edu.cn
Supported by:
Project supported by the Key-Area Research and Development Program of Guangdong Province of China (Grant No. 2018B030326001), the National Natural Science Foundation of China (Grant No. 11874065), the Guangdong Provincial Key Laboratory (Grant No. 2019B121203002), the Science, Technology and Innovation Commission of Shenzhen Municipality (Grant No. KYTDPT20181011104202253), and the Shenzhen Hong Kong Cooperation Zone for Technology and Innovation of China (Grant No. HZQB-KCZYB-2020050).

摘要/Abstract

摘要： Quantum entanglement, a key resource in quantum information processing, is reduced by interaction between the quantum system concerned and its unavoidable noisy environment. Therefore it is of particular importance to study the dynamical properties of entanglement in open quantum systems. In this work, we mainly focus on two qubits coupled to an adjustable environment, namely a semi-infinite transmission line. The two qubits' relaxations, through individual channels or collective channel or both, can be adjusted by the qubits' transition frequencies. We examine entanglement dynamics in this model system with initial Werner state, and show that the phenomena of entanglement sudden death and revival can be observed. Due to the hardness of preparing the Werner state experimentally, we introduce a new type of entangled state called pseudo-Werner state, which preserves as much entangling property as the Werner state, and more importantly, it is experiment friendly. Furthermore, we provide detailed procedures for generating pseudo-Werner state and studying entanglement dynamics with it, which can be straightforwardly implemented in a superconducting waveguide quantum electrodynamics system.

关键词: superconducting qubits, quantum entanglement, Werner state

Abstract: Quantum entanglement, a key resource in quantum information processing, is reduced by interaction between the quantum system concerned and its unavoidable noisy environment. Therefore it is of particular importance to study the dynamical properties of entanglement in open quantum systems. In this work, we mainly focus on two qubits coupled to an adjustable environment, namely a semi-infinite transmission line. The two qubits' relaxations, through individual channels or collective channel or both, can be adjusted by the qubits' transition frequencies. We examine entanglement dynamics in this model system with initial Werner state, and show that the phenomena of entanglement sudden death and revival can be observed. Due to the hardness of preparing the Werner state experimentally, we introduce a new type of entangled state called pseudo-Werner state, which preserves as much entangling property as the Werner state, and more importantly, it is experiment friendly. Furthermore, we provide detailed procedures for generating pseudo-Werner state and studying entanglement dynamics with it, which can be straightforwardly implemented in a superconducting waveguide quantum electrodynamics system.

Key words: superconducting qubits, quantum entanglement, Werner state

中图分类号: (Entanglement production and manipulation)

03.67.Bg

12.20.-m (Quantum electrodynamics) 85.25.Am (Superconducting device characterization, design, and modeling)

Yang-Qing Guo(郭羊青), Ping-Xing Chen(陈平形), and Jian Li(李剑). Entanglement properties of superconducting qubits coupled to a semi-infinite transmission line[J]. 中国物理B, 2023, 32(6): 60302-060302.

Yang-Qing Guo(郭羊青), Ping-Xing Chen(陈平形), and Jian Li(李剑). Entanglement properties of superconducting qubits coupled to a semi-infinite transmission line[J]. Chin. Phys. B, 2023, 32(6): 60302-060302.

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Entanglement properties of superconducting qubits coupled to a semi-infinite transmission line

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