Strongly coupled quantum dot-cavity systems provide a non-linear configuration of hybridized light-matter states with promising quantum-optical applications. Here, we investigate the coherent interaction between strong laser pulses and quantum dot-cavity polaritons. Resonant excitation of polaritonic states and their interaction with phonons allow us to observe coherent Rabi oscillations and Ramsey fringes. Furthermore, we demonstrate complete coherent control of a quantum dot-photonic crystal cavity based quantum-bit. By controlling the excitation power and phase in a two-pulse excitation scheme we achieve access to the full Bloch sphere. Quantum-optical simulations are in good agreement with our experiments and provide insight into the decoherence mechanisms.
@article{arxiv.1512.05952,
title = {Complete Coherent Control of a Quantum Dot Strongly Coupled to a Nanocavity},
author = {Constantin Dory and Kevin A. Fischer and Kai Müller and Konstantinos G. Lagoudakis and Tomas Sarmiento and Armand Rundquist and Jingyuan L. Zhang and Yousif Kelaita and Jelena Vuckovic},
journal= {arXiv preprint arXiv:1512.05952},
year = {2016}
}