• DOI:10.1140/epjb/e2013-40330-x
• Corpus ID: 119161690

Symmetric excitation and de-excitation of a cavity QED system

@article{Jonasson2012SymmetricEA,
  title={Symmetric excitation and de-excitation of a cavity QED system},
  author={O. Jonasson and Vidar Gudmundsson and Andrei Manolescu and Chi‐Shung Tang and Hsi-Sheng Goan},
  journal={The European Physical Journal B},
  year={2012},
  volume={86},
  pages={1-7}
}

• O. Jonasson, V. Gudmundsson, +2 authors H. Goan
• Published 29 July 2012
• Physics
• The European Physical Journal B

Abstract
We calculate the time evolution of a cavity-QED system subject to a time dependent
sinusoidal drive. The drive is modulated by an envelope function with the shape of a
pulse. The system consists of electrons embedded in a semiconductor nanostructure which is
coupled to a single mode quantized electromagnetic field. The electron-electron as well as
photon-electron interaction is treated exactly using “exact numerical diagonalization” and
the time evolution is calculated by numerically solving the equation of motion for the
system’s density matrix. We find that the drive causes symmetric excitation and
de-excitation where the system climbs up the Jaynes-Cummings ladder and descends back down
symmetrically into its original state. This effect is known at low electron-photon
coupling strengths but our main finding is how robust the effect is even at ultra-strong
coupling strength where the JC-model does not give qualitatively correct results. We
investigate the robustness of this symmetric behavior with respect to the drive de-tuning
and pulse duration.