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\(\mathcal{P}\mathcal{T}\)-symmetry-breaking induced suppression of tunneling in a driven non-Hermitian two-level system

  • Xiao Lian
  • Honghua ZhongEmail author
  • Qiongtao Xie
  • Xiaoqing Zhou
  • Yunwen Wu
  • Wenhu Liao
Regular Article

Abstract

We investigate the effect of parity-time (\(\mathcal{P}\mathcal{T}\)) symmetry on quantum tunneling dynamics for a periodically driven \(\mathcal{P}\mathcal{T}\)-symmetric non-Hermitian two-level system. We find that the quantum tunneling between two levels can be suppressed in a wide range of parameters in comparison with the Hermitian case, which is caused by the \(\mathcal{P}\mathcal{T}\)-symmetry-breaking. By employing the high-frequency Floquet approach, the parametric dependence of the spontaneous \(\mathcal{P}\mathcal{T}\)-symmetry-breaking transition is analytically and numerically explored. It is revealed that we can manipulate the \(\mathcal{P}\mathcal{T}\) symmetry by tuning the driving amplitude and frequency. Our results provide a promising approach for manipulating the \(\mathcal{P}\mathcal{T}\) symmetry by applying a periodic driving field.

Keywords

Quantum Optics 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Xiao Lian
    • 1
  • Honghua Zhong
    • 1
    • 2
    Email author
  • Qiongtao Xie
    • 3
  • Xiaoqing Zhou
    • 1
  • Yunwen Wu
    • 1
  • Wenhu Liao
    • 1
  1. 1.Department of PhysicsJishou UniversityJishouP.R. China
  2. 2.State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and EngineeringSun Yat-Sen UniversityGuangzhouP.R. China
  3. 3.School of Physics and Electronic EngineeringHainan Normal UniversityHaikouP.R. China

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