Quantum Properties of Colloidal CsPbBr3 quantum dots and coupling to SiN Bullseye cavity.

Many colloidal quantum dot systems like the organic and inorganic perovskites have received huge attention in quantum information science and engineering in recent days because of their relatively easy synthesis, efficient quantum light emitting properties, ease of photonic integration with other substrates and scalability. We investigate the low temperature behavior of single CsPbBr3 perovskite quantum dots. We observe the exciton fine structure splitting of the triplet and singlet states under magnetic field in Voigt geometry. The magnetic field breaks the rotational symmetry and we observe increased separation of the states with increasing field strength due to mixing of bright and dark energy levels. To enhance the emission intensity and lifetime, we design a suspended mode matched silicon nitride bullseye cavity and integrate the colloidal perovskites from the top surface. We study the quantum properties of these colloidal dots after cavity integration