Fast initialization of hole spin in a quantum dot-metal surface hybrid system

Abstract

In this work, we theoretically investigate the preparation of hole spin in a hybrid system consisting of a quantum dot (QD) and metal-dielectric interface. A cavity quantum electrodynamics (CQED) method is used to analyze the influence of surface plasmon polaritons (SPPs) on the emission of QD. Due to coupling between spin and interface (with a different value along different direction), a fast initialization beyond the GHz range can be achieved with high fidelity at reasonable external parameters, under both continuous wave and pulse excitation. Moreover, the distance between QD and metal is proved to be the most important element.