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Quantum Dynamics of Atomic Spatial Decoherence in a Squeezed Vacuum Field

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Abstract

We study the localization dynamics for a two level atom coupling with a single-mode cavity field initially in a squeezed vacuum state. The reduced density matrix for the atomic spatial degrees of freedom is given analytically where its decay behavior is described by a decoherence factor. It is found that the atomic spatial decoherence is induced by the back-action of the photon emitted from the atom and depends strongly on the field’s squeezed constant. For sufficiently large squeezed constant, the decoherence can occur in finite time. Our results also show that the maximal decay is related with the atomic position.

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Acknowledgements

We acknowledge support from the National Natural Science Foundation of China under Grant Nos. 11105021, 11175044.

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Authors and Affiliations

  1. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Wen-Ying Jiang & Zhi-Min Zhao

  2. School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin, 541004, China

    Wen-Ying Jiang

  3. Institute of Theoretical Physics, Northeast Normal University, Changchun, 130024, China

    Hui Yang & Tai-Yu Zheng

  4. Information Science and Engineering College, Dalian Polytechnic University, Dalian, 116034, China

    Li Zheng

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  1. Wen-Ying Jiang
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  2. Zhi-Min Zhao
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  3. Hui Yang
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  4. Li Zheng
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  5. Tai-Yu Zheng
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Correspondence to Tai-Yu Zheng.

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Jiang, WY., Zhao, ZM., Yang, H. et al. Quantum Dynamics of Atomic Spatial Decoherence in a Squeezed Vacuum Field. Int J Theor Phys 52, 4008–4014 (2013). https://doi.org/10.1007/s10773-013-1714-0

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  • DOI: https://doi.org/10.1007/s10773-013-1714-0

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