Femtosecond probing of few-fermion dynamics and deterministic single-photon gain in a single semiconductor quantum dot

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2010
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Sotier, Florian
Korger, Jan
Mahapatra, Suddhassatta
Brunner, Karl
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We report on femtosecond readout of the optical properties of a single CdSe/ZnSe quantum dot. Owing to the uncertainty principle, this timescale represents the ultimate limit for coherent quantum manipulation of such an artificial atom. After resonant excitation of a hot electron-hole pair the absorption of the fundamental exciton resonance is switched off via instantaneous Coulomb renormalization. Subsequently, optical gain builds up after ultrafast intraband relaxation. The speed of thermalization is dominated by the electron spin, since our system is charged permanently with one excess electron. When operating in the nonlinear regime, the number of quanta in a femtosecond light pulse may be changed by exactly ±1. We demonstrate that this deterministic single photon amplifier is characterized by a flat gain spectrum.

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ISO 690BRATSCHITSCH, Rudolf, Tim THOMAY, Florian SOTIER, Jan KORGER, Tobias HANKE, Suddhassatta MAHAPATRA, Alexander FREY, Karl BRUNNER, Alfred LEITENSTORFER, 2010. Femtosecond probing of few-fermion dynamics and deterministic single-photon gain in a single semiconductor quantum dot. In: Journal of Physics: Conference Series. Institute of Physics Publishing (IOP). 2010, 210, 012035. ISSN 1742-6588. eISSN 1742-6596. Available under: doi: 10.1088/1742-6596/210/1/012035
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@article{Bratschitsch2010-03-02Femto-52842,
  year={2010},
  doi={10.1088/1742-6596/210/1/012035},
  title={Femtosecond probing of few-fermion dynamics and deterministic single-photon gain in a single semiconductor quantum dot},
  volume={210},
  issn={1742-6588},
  journal={Journal of Physics: Conference Series},
  author={Bratschitsch, Rudolf and Thomay, Tim and Sotier, Florian and Korger, Jan and Hanke, Tobias and Mahapatra, Suddhassatta and Frey, Alexander and Brunner, Karl and Leitenstorfer, Alfred},
  note={Article Number: 012035}
}
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