The Spectrum in Qubit-Oscillator Systems in the Ultrastrong Coupling Regime

陈庆虎; 黎雷; 刘涛; 汪克林

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The Spectrum in Qubit-Oscillator Systems in the Ultrastrong Coupling Regime

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Recent measurement on an LC resonator magnetically coupled to a superconducting qubit [Phys.Rev.Lett.105 (2010)237001] shows that the system operates in the ultra-strong coupling regime and crosses the limit of validity for the rotating-wave approximation of the Jaynes-Cummings model By using extended bosonic coherent states,we solve the Jaynes-Cummings model exactly without using the rotating-wave approximation.Our numerically exact results for the spectrum of the flux qubit coupled to the LC resonator are fully consistent with the experimental observations.The smallest Bloch-Siegert shift obtained is consistent with that observed in this experiment.In addition,the Bloch-Siegert shifts in arbitrary level transitions and for arbitrary coupling constants are predicted.

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《中国物理快报：英文版》 |2012年第1期|137-140|共4页
作者
陈庆虎; 黎雷; 刘涛; 汪克林;
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作者单位

Center for Statistical and Theoretical Condensed Matter Physics;

Zhejiang Normal University;

Jinhua 321004;

Department of Physics;

Zhejiang University;

Hangzhou 310027;

School of Science;

Southwest University of Science and Technology;

Mianyang 621010;

Department of Modern Physics;

University of Science and Technology of China;

Hefei 230026;

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原文格式 PDF
正文语种 chi
中图分类理论物理学;
关键词
arbitrary; rotating; coupling;

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The Spectrum in Qubit-Oscillator Systems in the Ultrastrong Coupling Regime

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