Symmetric excitation and de-excitation of a cavity QED system

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 electr...

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Bibliographic Details
Published inThe European physical journal. B, Condensed matter physics Vol. 86; no. 6
Main Authors Jonasson, Olafur, Gudmundsson, Vidar, Manolescu, Andrei, Tang, Chi-Shung, Goan, Hsi-Sheng
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer-Verlag 01.06.2013
EDP Sciences
Springer
Subjects
Cavity quantum electrodynamics ; micromasers
Complex Systems
Condensed Matter Physics
Exact sciences and technology
Fluid- and Aerodynamics
Fundamental areas of phenomenology (including applications)
Optics
Physics
Physics and Astronomy
Quantum optics
Regular Article
Solid State Physics
Mesoscopic and Nanoscale Systems
Cavities
Diagonalization
Time dependence
De-excitation
Photon-electron interactions
Envelope function
Jaynes-Cummings model
Quantum electrodynamics
Hamiltonians
Two-level systems
Density matrix
Equations of motion
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Summary: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.
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/e2013-40330-x