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Chin. Phys. B, 2026, Vol. 35(6): 064204    DOI: 10.1088/1674-1056/ae4f71
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Non-reciprocal and artificial Λ-type systems in waveguide QED with parametrically modulated superconducting qubits

Bing-Jie Chen(陈炳杰)1,2, Li Li(李力)1,2, Rui-Yang Gong(龚锐洋)3, Silu Zhao(赵思路)1,2, Shi Xiao(肖师)1,2,4, Xiaohui Song(宋小会)1,2,5, Zhongcheng Xiang(相忠诚)1,2,5, and Dongning Zheng(郑东宁)1,2,5,†
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 School of Physics, Sun Yat-sen University, Guangzhou 510275, China;
4 Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China;
5 Hefei National Laboratory, Hefei 230088, China
Abstract  We present a non-local quantum system based on a waveguide QED architecture, comprising two spatially separated and largely detuned superconducting transmon qubits. By applying parametric frequency modulation to one of the qubits, we establish a tunable coherent channel between the two far-detuned qubits, thereby forming an Λ-type three-level system. We demonstrate that tuning the modulation amplitude enables the observation of spectral evolution from electromagnetically induced transparency (EIT) to Autler–Townes splitting (ATS). Furthermore, by exploiting the interplay between the non-local waveguide phase and system dissipation, the system achieves significant non-reciprocal microwave transmission and direction-selective photon emission. The scheme operates without external magnetic fields, offering an efficient pathway for realizing on-chip integrated quantum routers and isolators.
Keywords:  waveguide QED      superconducting qubits      parametric modulation  
Received:  20 January 2026      Revised:  25 February 2026      Accepted manuscript online:  10 March 2026
PACS:  42.50.Pq (Cavity quantum electrodynamics; micromasers)  
  42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)  
  03.65.Yz (Decoherence; open systems; quantum statistical methods)  
  03.67.Lx (Quantum computation architectures and implementations)  
Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 12574540, 92265207, and T2121001) and Quantum Science and Technology – National Science and Technology Major Project of China (Grant No. 2021ZD0301800).
Corresponding Authors:  Dongning Zheng     E-mail:  dzheng@iphy.ac.cn

Cite this article: 

Bing-Jie Chen(陈炳杰), Li Li(李力), Rui-Yang Gong(龚锐洋), Silu Zhao(赵思路), Shi Xiao(肖师), Xiaohui Song(宋小会), Zhongcheng Xiang(相忠诚), and Dongning Zheng(郑东宁) Non-reciprocal and artificial Λ-type systems in waveguide QED with parametrically modulated superconducting qubits 2026 Chin. Phys. B 35 064204

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