"Organic and inorganic lead halide perovskite nanocrystals (pNCs) have been intensively studied in the recent years for their outstanding optical properties such as the high brightness (quantum efficiencies up to 90%), the tunable optical bandgap, the reduced blinking, and the easy and low-cost fabrication. At the individual nanocrystal level, single photon emission at room temperature and long coherence times at cryogenic temperature have been observed. These characteristics are very promising to use pNCs as building blocks for efficient single photon generation for quantum optics and quantum communication applications.
In this context, the coupling of single pNCs to an optimized photonic structure is an important step to efficiently collect the emitted photons and cavity Quantum Electro-Dynamics (cQED) effects could be exploited. Lately, the team designed and implemented a reconfigurable opened fiber-based microcavity, allowing us to study the same nano-emitter in free space and in cavity which is especially suitable for CsPbBr3 pNCs.
The aim of this thesis is to measure the acceleration of spontaneous emission (Purcell effect) by time-resolved spectroscopy of a single pNC  in the weak coupling regime. In this regime, the conditions for generating indistinguishable photons should be reached, and the degree of photon indistinguishability will then be studied by two-photon interference experiments (Hong-Ou-Mandel)."

Research unit : LPENS (Laboratoire de Physique de l’Ecole Normale Supérieure) / Nano-Optics

Advisor : Carole Diederichs

Keywords : Perovskite, Nanocrystals, Photoluminescence, Microcavity, Exciton, Cavity quantum electrodynamics