On-chip quantum optics with integrated electrically driven microlasers

This paper presents a novel concept for on-chip quantum optics and fully integrated quantum light sources which uses for the first time an integrated microcavity laser as coherent light source. This concept combines so far independent routes, namely the study of light matter interaction at the quantum limit and the development of low threshold microcavity lasers, in the emerging field of cQED in solid state within an integrated nanophotonics device concept with unprecedented features. The proposed concept utilizes the intriguing fact that micropillar cavities allow not only for the localization of vertically emitting modes but also support laterally emitting whispering gallery modes (WGMs). This approach takes advantage of this unique opportunity provided by the micropillar geometry and comprises an electrically pumped WGM micropillar acting as in-plane laser source and radially displaced QD-micropillars which are optically pumped by the integrated microlaser in resonant excitation schemes.