SINGLE-PHOTON GENERATOR AND SINGLE-PHOTON GENERATING METHOD

摘要

The invention relates to a single-photon generator and a single-photon generating method, which theoretically makes it possible to precisely generate a single photon in real time. A three-level lambda system is formed of a coupled quantum dots group, which is a set of a number of coupled quantum dots where a couple of quantum dots having different ground quantum levels are coupled. The entirety is made in an exciton ground state through illumination with first excitation light. Then, the number of photons in the Raman scattering light through illumination with second excitation light is detected, and a single excited Dicke state is achieved. After that, a single photon is generated accompanying the transition from the single excited Dicke state to the exciton ground state through illumination with third excitation light.

主权项

1. A single-photon generator comprising: a coupled quantum dots group, which is a set of a number of coupled quantum dots made of a coupled pair of quantum dots having different ground quantum levels; a first pumping light illumination means for illuminating the coupled quantum dots group with first excitation light so that a multiple number of coupled quantum dots are made to be in an exciton ground state; a second pumping light illumination means for illuminating the coupled quantum dots group in the exciton ground state with second excitation light so that the coupled quantum dots group is made in the excited Dicke state through Raman scattering; a photon number detection means for detecting the number of photons in the Raman scattering light due to the Raman scattering; a control means for controlling the second pumping light illumination means so that the excited Dicke state becomes a single excited Dicke state using the detection results by the photon number detection means; and a third pumping light illumination means for illuminating the coupled quantum dots group in the single excited Dicke state with third excitation light so that a single photon is generated accompanying the transition of the coupled quantum dots group from the single excited Dicke state to the exciton ground state due to Raman scattering.