Controlling Entropy Squeezing of Atomic Qubit in the Microwave Cavity by Manipulating the other Atomic Qubit Outside the Cavity

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• 作者：Xiao-Juan Liu (1)
  Zhao-Hui Peng (1)
  Bing-Ju Zhou (1)
  Chun-Xia Jia (1)
  
  1. College of Physics and Electronics Science ; Hunan University of Science and Technology ; Xiangtan ; 411201 ; China
  
• 关键词：Optimal entropy squeezing state ; Rotation operation ; Atomic qubit.
• 刊名：International Journal of Theoretical Physics
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：54
• 期：4
• 页码：1258-1268
• 全文大小：588 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Physics
  Quantum Physics
  Elementary Particles and Quantum Field Theory
  Mathematical and Computational Physics
  
• 出版者：Springer Netherlands
• ISSN：1572-9575

文摘

Using information entropy squeezing theory, we investigate the information entropy squeezing properties of atomic qubit inside a microwave cavity by manipulating the other atomic qubit outside the cavity, where two atomic qubits are initially in the Bell state. We discuss the time evolution of entropy squeezing factor for atomic qubit inside the cavity for two cases, namely before and after performing rotation operations and measuring atomic qubit outside by numerical calculation. It is shown that atomic qubit inside the cavity has always no entropy squeezing phenomenon before manipulating atomic qubit outside the cavity. However, the optimal entropy squeezing state of atomic qubit can be generated by adjusting appropriate rotation angle and choosing interaction time between atomic qubit and the cavity field. The essential idea is cutting the entanglement between atomic qubit and its environment, leading the initial decoherent state into maximal coherent superposition state. Our proposal provides a possible way for recovering coherence of single atomic qubit in noise environment.