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Optical control of nonlinearly dressed states in an individual quantum dot

机译：单个量子点中非线性修饰态的光学控制

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摘要

We report nonlinear resonance fluorescence of an individual semiconductor quantum dot. By driving a single semiconductor quantum dot via a two-photon transition, we probe the linewidth of two-photon excitation processes and show that, similar to their single-photon counterparts, they are close to being Fourier limited at low temperatures. The evolution of the population of excitonic states with increasing Rabi energy exhibits a clear S-shaped behavior, indicative of the nonlinear response via the two-photon excitation process. Numerical calculations of the nonlinear response using a four-level atomic system representing the manifold of excitonic and biexcitonic states in the quantum dot are in excellent agreement with our experiments and reveal the effect of interactions with LA phonons in the solid-state environment. Finally, we demonstrate the formation of dressed states emerging from a nonlinear two-photon interaction between the quantum dot and the optical excitation field. The nonlinear optical dressing induces a mixing of all four excitonic states that allows direct optical tuning of the polarization selection rules and energies of the dressed states in the artificial atom. We expect our results to play a pivotal role for the generation of nonclassical photon pairs desired for applications in quantum communication and fundamental experiments on quantum optical properties of photons.
机译：我们报告单个半导体量子点的非线性共振荧光。通过经由双光子跃迁驱动单个半导体量子点，我们探究了双光子激发过程的线宽，并表明，与它们的单光子对应物相似，它们在低温下接近于傅立叶极限。随着拉比能量的增加，激子态种群的演化表现出明显的S形行为，表明了通过双光子激发过程的非线性响应。使用代表量子点中激子和双激子态流形的四能级原子系统进行的非线性响应的数值计算与我们的实验非常吻合，并揭示了在固态环境中与LA声子相互作用的影响。最后，我们证明了量子点与光激发场之间的非线性双光子相互作用产生的整装态的形成。非线性光学修整会引起所有四个激子态的混合，从而可以对人造原子中偏振选择规则和修整态的能量进行直接光学调谐。我们希望我们的结果对产生非经典光子对起关键作用，这些对子在量子通信和光子量子光学性质的基础实验中需要应用。

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  • 来源
    《Physical review》 |2016年第16期|165305.1-165305.6|共6页
  • 作者

    P.-L. Ardelt; M. Koller; T. Simmet; L. Hanschke; A. Bechtold; A. Regler; J. Wierzbowski; H. Riedl; J. J. Finley; K. Mueller;

  • 作者单位

    Walter Schottky Institut and Physik-Department, Technische Universitat Munchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik-Department, Technische Universitat Munchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik-Department, Technische Universitat Munchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik-Department, Technische Universitat Munchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik-Department, Technische Universitat Munchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik-Department, Technische Universitat Munchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik-Department, Technische Universitat Munchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik-Department, Technische Universitat Munchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik-Department, Technische Universitat Munchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik-Department, Technische Universitat Munchen, Am Coulombwall 4, 85748 Garching, Germany;

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