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Chin. Phys. B, 2012, Vol. 21(10): 104205    DOI: 10.1088/1674-1056/21/10/104205

Controlling group velocity in a superconductive quantum circuit

Qiu Tian-Hui (邱田会), Yang Guo-Jian (杨国建)
Department of Physics and Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China
Abstract  We investigate the controllable group velocity of a microwave probe field in a superconductive quantum circuit (SQC) pumped by microwave fields, and the use of such a SQC function as an artificial Λ-type three-level atom. The exchange between the subluminal and the superluminal states of the probe field can be realized simply by sweeping the pumping intensity, and the superluminal state is usually realized with a lower absorption. This work is one of the efforts to extend the study of electromagnetically induced transparency and its related properties from the lightwave band to the microwave band.
Keywords:  subluminal      superluminal      superconductive quantum circuit      group velocity  
Received:  05 March 2012      Revised:  20 April 2012      Accepted manuscript online: 
PACS:  42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)  
  85.25.-j (Superconducting devices)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 111174040) and the Fundamental Research Funds for the Central Universities.
Corresponding Authors:  Yang Guo-Jian     E-mail:

Cite this article: 

Qiu Tian-Hui (邱田会), Yang Guo-Jian (杨国建) Controlling group velocity in a superconductive quantum circuit 2012 Chin. Phys. B 21 104205

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