Controlling Dissipation and Decoherence in Nanodevices

Yuli Lyanda-Geller

Department of Physics and Birck Center for Nanotechnology, Purdue University

The development of nanotechnology raises fundamental questions of quantum coherence, dephasing and dissipation in nanostructures. These concepts are vital for new devices and systems, for conventional computing and quantum information technology.  
    
I will (1) compare two major dissipation mechanisms in quantum dots, (2) show the role of system symmetry in dissipation, and (3) discuss the relation between decoherence and quasi-particle localization. As an example, I will describe mechanisms of nuclear spin decoherence in quantum dots, and show that relaxation times can be controlled via the Coulomb blockade charging effects, and changed by seven orders of magnitude by applying gate voltage.

Finally, I will present my view on what are major scientific questions in this field.