Ultrafast polariton-phonon dynamics of strongly coupled quantum dot-nanocavity systems

Müller, Kai and Fischer, Kevin A. and Rundquist, Armand and Dory, Constantin and Lagoudakis, Konstantinos G. and Sarmiento, Tomas and Kelaita, Yousif A. and Borish, Victoria and Vučković, Jelena (2015) Ultrafast polariton-phonon dynamics of strongly coupled quantum dot-nanocavity systems. Physical Review X, 5 (3). 031006. ISSN 2160-3308 (https://doi.org/10.1103/PhysRevX.5.031006)

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We investigate the influence of exciton-phonon coupling on the dynamics of a strongly coupled quantum dot-photonic crystal cavity system and explore the effects of this interaction on different schemes for nonclassical light generation. By performing time-resolved measurements, we map out the detuning-dependent polariton lifetime and extract the spectrum of the polariton-to-phonon coupling with unprecedented precision. Photon-blockade experiments for different pulse-length and detuning conditions (supported by quantum optical simulations) reveal that achieving high-fidelity photon blockade requires an intricate understanding of the phonons' influence on the system dynamics. Finally, we achieve direct coherent control of the polariton states of a strongly coupled system and demonstrate that their efficient coupling to phonons can be exploited for novel concepts in high-fidelity single-photon generation.