Single photons sources on multimodal GaAs photonic integrated circuits using resonant excitation

Abstract

Among the platforms used for the development of quantum information systems, photonic integrated circuits are very promising for the generation, manipulation, and detection of qubits - the basic quantum information unit - due to their high stability, reconfigurability, and scalability. This makes them ideal candidates for the development of disruptive technologies that allow the application of unique quantum mechanical concepts, such as superposition and entanglement, to significantly improve the characteristics related to the capacity, speed, and safety of various tasks currently performed by classical systems. Nowadays, a huge scientific and technological challenge is to obtain a single-photon emitter that perfectly meets the high purity, indistinguishability, and brightness criteria necessary for advanced photonic quantum systems. In this document, I propose a work to study, fabricate and characterize a single-photon source based on InAs quantum dots embedded in monolithic GaAs photonic circuits. The work aims to provide a high spontaneous emission rate, allow on-chip resonant excitation and single-photon collection, in addition to addressing important fabrication constraints for improved emitter performance. Besides the contributions to the development of photonic quantum systems, the work has the potential to explore issues related to the inverse design of integrated photonic circuits and also allow for a deeper discussion on the effects of fabrication processes over the quantum dots emission. (AU)