Quantum-Optical Spectroscopy of a Two-Level System Using an Electrically Driven Micropillar Laser as Resonant Excitation Source

Two-level emitters constitute core elements of photonic quantum systems and exploring their physics is at the heart of quantum optics [1]. Of special interest is the strict-resonant coherent optical excitation of such emitters to generate quantum light with close to ideal properties [2]. Up till now related experiments have been performed exclusively using bulky lasers. This hinders the application of resonantly driven two-level emitters in quantum technology, which relies on the availability of compact sources of indistinguishable photons. Here we demonstrate the first quantum-optical spectroscopy of a two-level system using a compact microlaser as excitation source [3].