Nonclassical states generation by quantum dots and their clusters

One of the current goals of quantum optics is the production of single photons. There are many types of single-photon emitters such as atoms or ions, molecules, quantum dots, or colour centres in diamond. Many of such emitters also occur in clusters, such that they cannot be resolved using simple optical measurements. This is where measurement of photon statistics can be extremely helpful. Moreover, a cluster of single-photon emitters may produce states that are not single photons but higher-order Fock states, even more interesting from the viewpoint of applications. This PhD project is aimed at the characterization of single quantum dots and their clusters using an array single-photon detector (ICCD camera), both for spatial and photon-number resolution. We will primarily focus on colloidal CdS/CdSe ‘dots-in-rods’, which provide good single-photon emission and high degree of polarization. This work is part of the on-going European project ‘Nanoquint’.

Top: 'dots-in-rods' and their clusters and the structure of a single 'dot-in-rod'. Bottom: excitation beam (blue) and fluorescent dots (red) imaged on an ICCD camera after a beamsplitter.