讲座名称：Quantum spintronics with semiconductors
Our technological preference for perfection can only lead us so far: as traditional transistor-based electronics rapidly approach the atomic scale, small amounts of disorder begin to have outsized negative effects. Surprisingly, one of the most promising pathways out of this conundrum may emerge from current efforts to embrace defects and construct 'quantum machines’ that enable new information processing and sensing technologies based on the quantum nature of electrons and atomic nuclei. Recently, individual defects in diamond, silicon carbide, and other wide-gap semiconductors have attracted interest as they possess an electronic spin state that can be employed as a solid state quantum bit at and above room temperature. These systems have a built-in optical interface in the visible and telecom bands, retain their coherence over millisecond timescales, and can be polarized, manipulated, and read out using a simple combination of light and microwaves. With these foundations in hand, we present demonstrations of gigahertz coherent control, nuclear spin quantum memories, ensemble entanglement and nanometer-scale sensing at the level of single spins for emerging applications in science and technology.
David Awschalom (University of Chicago, US)
Professor Awschalom is one of the world’s leading research scientists in spintronics and quantum information engineering. His research in spintronics involves understanding and controlling the spin of electrons for advanced computing, medical imaging, encryption, and other technologies.His group has research activities in optical and magnetic interactions in semiconductor quantum structures, spin dynamics and coherence in condensed matter systems, macroscopic quantum phenomena in nanometer-scale magnets, and implementations of quantum information processing in the solid state. He has developed a variety of femtosecond-resolved spatiotemporal spectroscopies and micromagnetic sensing techniques aimed at exploring charge and spin motion in the quantum domain. In 2004, his group made the first experimental observation of the spin Hall effect in semiconductors. He has published 252papers in these areas, andmore than50 of them have been published inNature, Science.