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
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.
(Superconducting device characterization, design, and modeling)
Fund: 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).
Corresponding Authors:
Jian Li
E-mail: lij33@sustech.edu.cn
Cite this article:
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 2023 Chin. Phys. B 32 060302
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