High-quality single-photon source is the basis for the realization of optical quantum information technology 20, the reporter learned from Zhejiang University, the school of photoelectric Fang Wei and Department of Chemistry Jinyi Zheng, Peng Xiaogang cooperation for the first time at room temperature based on colloidal quantum dot-based electricity Driven high-purity single-photon source, which opens up a new path for the development of a practical and integrated single-photon source. The research paper of this achievement was published in the journal Nature Journal.
The sun, light and other issued are all 'Baotuan' photons, and the single-photon source emits a maximum of one photon within a certain time.Weifang introduced photon 'single' in order to achieve a new generation of quantum communication, quantum computer technology to achieve Must rely on the quantum effect.Design and manufacture of integrated, easy to use the ideal single-photon source has been the goal pursued by scientists.Since 2014, Fang Wei and other scholars try to use colloidal quantum dots to create a new single-photon source.
Colloidal quantum dots are known as nanocrystalline materials with excellent luminescence properties and the goal scientists are trying to achieve is how to make a single quantum dot efficiently emit one photon at room temperature by electric excitation.In the quantum dot, Photons are emitted by recombination with holes. Since electrons in semiconducting materials 'run' much faster under normal conditions, and you want to create a harmonious 'composite' in a single quantum dot, you have to find a way to balance the two Rate.
In Zhejiang University State Key Laboratory of modern optical instruments, the reporter saw a piece of fingernail-sized transparent devices, the thickness of less than one millimeter of the structure, contains a clever design: they will single colloidal quantum dots wrapped with insulating layer The insulating layer slowed the pace of electrons and prevented the direct recombination of electrons and holes to produce 'stray light.' Driven by a voltage of 2.6 V, a single colloidal quantum dot was successfully excited and the screen On the tip of the spot to see the bright spot, it is the colloidal quantum dots issued by a one-way 'photons.
