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Conference on Lasers and Electro-Optics

Quantum efficiency and emission spectra of single-photon sources in the cavity-QED strong-coupling regime

Guoqiang Cui, Michael G. Raymer

Published Jan 1, 2006• 0 citations
Publisher

Abstract

We derive analytical formulas for the quantum efficiency and emission spectra of single-photon sources in the cavity-QED strong-coupling regime. We investigate the effects of pure dephasing, treated in the phase-diffusion model, on these results.
DOI
10.1109/cleo.2006.4628864

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We derive analytical formulas for the forward emission and side emission spectra of cavity-modified single-photon sources, as well as the corresponding normal-mode oscillations in the cavity quantum electrodynamics strong-coupling regime. We investigate the effects of pure dephasing, treated in the phase-diffusion model based on a Wiener-Levy process, on the emission spectra and normal-mode oscillations. We also extend our previous calculation of quantum efficiency to include the pure dephasing process. All results are obtained in the Weisskopf-Wigner approximation for an impulse-excited emitter. We find that the spectra are broadened, the depths of the normal-mode oscillations are reduced and the quantum efficiency is decreased in the presence of pure dephasing.
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We have computed the spectrum emitted spontaneously by a quantum dot coupled to an arbitrarily detuned single mode cavity, taking into account pure dephasing processes. We show that if the emitter is incoherent, the cavity can efficiently emit photons with its own spectral characteristics. This effect opens unique opportunities for the development of devices exploiting both cavity quantum electrodynamic effects and pure dephasing, such as wavelength-stabilized single-photon sources robust against spectral diffusion.
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