Guillermo F. Quinteiro
RESEARCH INTERESTS
From a fundamental perspective as well as its technological possibilities, the application of quantum mechanics to solve the physics of nanostructures and the interaction of light and matter is one of the most interesting topics I find in physics. Closely related to this field, quantum information has attracted much of my interest. If successful in its implementation, it will cause a profound change in science and technology. Moreover, it will help us to gain insight into basic questions of foundations of quantum mechanics.
CURRENT PROJECTS
Indirect spin-spin interactions in micro-cavity quantum wells: My recent research in optically control indirect interaction in micro-cavities quantum wells for extremely low concentration of impurities seems to lead to a very interesting result. Compared to the case where no cavity is present, the interaction appears to be stronger and longer range. This sheds light into the basic understanding of polariton mediated interaction. In addition, these results are promising for quantum computing applications. For large separation between spins allows the use of magnetic fields to address each single impurity and perform one qubit operations in an easy and natural way (Current technological difficulties make this impracticable in common proposals of quantum computers, because focusing of B-fields to small regions is hard). If the spin-spin coupling strength remains within reasonable values, two qubit operations may also be feasible.
Interaction of solids with twisted light: Light carrying arbitrary orbital angular moment, or twisted light, can be nowadays easily produced in the lab. The interaction with solids presents very interesting features that we are currently exploring in a variety of systems. For example, we have found that twisted light induces electric currents in bulk and quantum rings, and new optical transitions in quantum dots.
FORMER PROJECTS
Nuclear reactor and medical physics: During the first years of my research career I worked in nuclear reactor and medical physics. The former was related to the study, by computational techniques, of the kinetic parameters associated with nuclear reactors. The latter, dealt with the optimization of a BNCT biological facility; this research involved both computational and experimental techniques.
Soft condensed matter: Using an optical experimental technique known as FRAP, I studied the transport properties of threalose molecular systems close to the glass transition temperature. The aim of the project was to understand the diffusion in this glassy matrix. Glassy matrix can be used to store medicine and food.
Solid state physics: My PhD research in condensed matter theory dealt with the optical control of spins in semiconductor structures - quantum dots, quantum wells, micro-cavities and bulk - as well as their applications to quantum information. Some of the topics I have addressed are: Solving non-perturbatively the indirect spin-spin interaction mediated by excitons, controlling the spin entanglement and errors in two-qubit operations, how cavity QED can modify the spin-spin coupling, as well as the Curie temperature of an array of such spins (DMS), and the new possibilities the use of polaritons open for quantum information.
TALKS
Twisted light - Minas Gerais, Brazil 2014
Twisted light - Muenster, Germany 2011
PRESS
International Day of Light, Buenos Aires 2018