We report on strong coupling for cavity QED between different excitonic states in a single quantum dot and the cavity, two-photon Rabi splitting in a strongly coupled cavity-dot system is demonstrated. Both exciton and biexciton transitions couple to a high quality factor photonic crystal cavity with large coupling strengths over 130 μeV. When the cavity to simultaneously couple with two exciton states, two-photon Rabi splitting between biexciton and cavity is achieved, which can be well reproduced by theoretical calculations with quantum master equations. Further, strong interactions between cavities and p-shell excitons with a great enhancement by the in situ wave-function control will be demonstrated because of the large wave-function extents and nonlocal interactions beyond the dipole approximation. A large coupling strength of 210 eV has been achieved, indicating the great potential of p-shell excitons for coherent information exchange.

报告人简介：Dr Xiulai Xu received BA degree in Electronic Engineering from the Jilin University in 1996, and Ph.D. degree from Cavendish Laboratory, University of Cambridge in 2005. He has been working as research scientist, senior research scientist in Hitachi Cambridge Laboratory from 2005-2011, and was also a research fellow in Clare Hall, University of Cambridge during 2009-2011. He is currently a professor with Institute of Physics, Chinese Academy of Sciences on quantum optoelectronics and nano-photonics.