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Symmetric excitation and de-excitation of a cavity QED system |
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| Authors: | Olafur?Jonasson,Vidar?Gudmundsson author-information" > author-information__contact u-icon-before" > mailto:vidar@hi.is" title=" vidar@hi.is" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Andrei?Manolescu,Chi-Shung?Tang,Hsi-Sheng?Goan |
| Affiliation: | 1.Science Institute, University ofIceland,Reykjavik,Iceland;2.Reykjavik University, School ofScience and Engineering,Reykjavik,Iceland;3.Department of Mechanical Engineering,National United University,Miaoli,Taiwan;4.Department of Physics and Center forTheoretical Sciences,National Taiwan University,Taipei,Taiwan;5.Center for Quantum Science andEngineering, National Taiwan University,Taipei,Taiwan |
| Abstract: | We calculate the time evolution of a cavity-QED system subject to a time dependentsinusoidal drive. The drive is modulated by an envelope function with the shape of apulse. The system consists of electrons embedded in a semiconductor nanostructure which iscoupled to a single mode quantized electromagnetic field. The electron-electron as well asphoton-electron interaction is treated exactly using “exact numerical diagonalization” andthe time evolution is calculated by numerically solving the equation of motion for thesystem’s density matrix. We find that the drive causes symmetric excitation andde-excitation where the system climbs up the Jaynes-Cummings ladder and descends back downsymmetrically into its original state. This effect is known at low electron-photoncoupling strengths but our main finding is how robust the effect is even at ultra-strongcoupling strength where the JC-model does not give qualitatively correct results. Weinvestigate the robustness of this symmetric behavior with respect to the drive de-tuningand pulse duration. |
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