Coherent photonic coupling of semiconductor quantum dots

Technishe Physik, Universität Würzburg, Germany.
Optics Letters (Impact Factor: 3.29). 07/2006; 31(11):1738-40. DOI: 10.1364/OL.31.001738
Source: PubMed


We report a new type of coupling between quantum dot excitons mediated by the strong single-photon field in a high-finesse micropillar cavity. Coherent exciton coupling is observed for two dots with energy differences of the order of the exciton-photon coupling. The coherent coupling mode is characterized by an anticrossing with a particularly large line splitting of 250 microeV. Because of the different dispersion relations with temperature, the simultaneous photonic coupling of quantum dot excitons can be easily distinguished from cases of sequential strong coupling of two quantum dots.

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    • "The studied optical system is composed of two spatially separated quantum emitters (e.g., neutral QDs) coupled to a one-sided optical cavity with the coupling strength g j (j = 1, 2), as shown schematically in Fig. 1. Such a device has already been experimentally demonstrated using a photonic crystal cavity [8] [9] [10], a micropillar cavity [11] [12] [13], Fabry-Perot cavity [34] [35] [36], or microcavity of other geometry [37]. Each QD has two possible states (a ground state |1 and an excited state |2) with transition frequency ω 0 , spontaneous decay rate γ 0 , and pure dephasing rate γ d , respectively. "
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    ABSTRACT: A lot of experimental and theoretical studies of a system in cavity quantum electrodynamics (cavity QED), which consists of two spatially separated quantum emitters strongly coupled to a single optical cavity mode, have recently attracted much interest in the quantum optics community for various quantum information applications. Here, we propose a method for high-order harmonic generation in a photonic crystal microcavity coupled to single semiconductor quantum dots (QDs). The system is coherently driven by a bichromatic laser consisting of the control and signal fields at low input power (a few nanowatts) and the cavity output power via the cavity loss channel is monitored. Via numerical simulations, we thoroughly explore the difference of the generated high-order harmonic spectra between two QDs, one QD, and zero QDs in microcavity. The results clearly indicate that harmonic generation can be significantly enhanced via collective coherent coupling in the case of two spatially separated QDs coupled to the same photonic crystal microcavity mode. In addition, we present a study of the carrier-envelope phase (CEP) effect on high-order harmonic spectra, which may provide the insight of CEP effect in a new regime. Beyond this, our obtained results also apply to other classes of single-mode cavity-QED setup incorporating two-level atoms or comparable solid-state emitters.
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    ABSTRACT: © 2006 Optical Society of America
    No preview · Article · Dec 2006 · Optics Letters
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    ABSTRACT: The authors report on AlAs/GaAs micropillar cavities with unprecedented quality factors based on high reflectivity distributed Bragg reflectors (DBRs). Due to an increased number of mirror pairs in the DBRs and an optimized etching process record quality (Q) factors up to 165.000 are observed for micropillars with diameters of 4 μm. Optical studies reveal a very small ellipticity of 5×10−4 of the pillar cross section. Because of the high Q factors, strong coupling with a vacuum Rabi splitting of 23 μeV is observed for micropillars with a diameter of 3 μm.
    Full-text · Article · Jun 2007 · Applied Physics Letters
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