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Decoherence Dynamics of a Superconducting Charge Qubit Coupled to a Boson Bath and a Spin Bath

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Abstract

By virtue of a superconducting charge qubit, we derive the off-diagonal matrix operator and investigate the decoherence of the system in different regimes coupled to, respectively, the boson bath and the spin bath. It is found that the two different baths make a bit of difference on the decay of the system at low but finite temperature and the decoherence of the system is most closely linked with the regime as well as the coupling strength. Therefore, by optimizing some reasonable parameters, we can suppress appropriately the decoherence of a given quantum system.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant Nos. 11147009 and 11244005), the Natural Science Foundation of Shandong Province, China (Grant No. ZR2012AM004), and the Science Foundation of Liaocheng University (Grant No. 318011308).

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Authors and Affiliations

  1. Shandong Provincial Key Laboratory of Optical Communication Science and Technology, School of Physical Science and Information Engineering, Liaocheng University, Liaocheng, 252059, People’s Republic of China

    Qin-Ying Yang & Bao-Long Liang

  2. College of Physics and Engineering, Qufu Normal University, Qufu, 273165, People’s Republic of China

    Ji-Suo Wang

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  1. Qin-Ying Yang
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  2. Bao-Long Liang
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  3. Ji-Suo Wang
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Correspondence to Ji-Suo Wang.

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Yang, QY., Liang, BL. & Wang, JS. Decoherence Dynamics of a Superconducting Charge Qubit Coupled to a Boson Bath and a Spin Bath. Int J Theor Phys 53, 1–9 (2014). https://doi.org/10.1007/s10773-013-1762-5

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  • DOI: https://doi.org/10.1007/s10773-013-1762-5

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