Tomography of the optical polarization rotation induced by a single quantum dot in a cavity
C. Antón, Paul Hilaire, Christian Kessler, Justin Demory, Carmen Gomez Carbonell, Aristide Lemaître, Isabelle Sagnes, Norberto Daniel Lanzillotti-Kimura, O. Krebs, Niccolò Somaschi · Figshare · 2017
We introduce a tomography approach to describe the optical response of a cavity quantum electrodynamics device, by analyzing the polarization density matrix of the reflected photons in the Poincar\'e sphere. Applying this approach to an electrically-controlled quantum dot-cavity device, we show that the superposition of emitted single photons with directly-reflected photons leads to a large rotation of the output polarization, by 20º in latitude and longitude in the Poincaré sphere, with a polarization purity remaining above 84%. This polarization tomography illustrates how incoherent processes have to be included, in the framework of solid-state quantum technologies, to describe the optical response of a device beyond the semiclassical image.