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arXiv:1606.08120 · Physical Review A

Thermal effects on the resonance fluorescence of doubly dressed artificial atoms

David F. Macías-Pinilla, Hanz Y. Ramírez

Published Sep 30, 2020• 3 citations
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Abstract

In this work, robustness of controlled density of optical states in doubly driven artificial atoms is studied under phonon dissipation. By using both perturbative and polaron approaches, we investigate the influence of carrier-phonon interactions on the emission properties of a two-level solid-state emitter, simultaneously coupled to two intense distinguishable lasers. Phonon decoherence effects on the main features of the emission spectra are found to be modest up to neon boiling temperatures ($\ensuremath{\sim}30$ K), as compared with photon generation at the Fourier transform limit obtained in the absence of lattice vibrations (zero temperature). These results show that optical switching and photonic modulation by means of double dressing do not require ultralow temperatures for implementation, thus boosting their potential technological applications.

DOI
10.1103/physreva.102.033731

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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.