A method for generating two-photon radiation based on single quantum dots

Abstract

The invention belongs to the field of quantum information, in particular to a method for generating two-photon radiation on the basis of a single quantum dot. Generation of two photons has great significance in the quantum information field such as quantum key distribution, quantum entanglement, quantum measurement and the like. The method for generating two-photon radiation on the basis of the single quantum dot is provided and comprises steps as follows: firstly, a near infrared single quantum dot is prepared on a slide with a indium tin oxide film formed through evaporation plating; then, indium tin oxide nanoparticles cover the single quantum dot; the indium tin oxide nanoparticles are spin-coated with polystyrene polymer films, and influence of the external environment on the quantum dot is effectively isolated; laser co-focusing is performed on the sample, and two-photon fluorescence radiation is generated for the single quantum dot. With the adoption of the indium tin oxide nanoparticles, nonradiative auger recombination of biexciton of the quantum dot is effectively inhibited, and two-photon radiation of the single quantum dot is realized.

Description

technical field [0001] The invention belongs to the field of quantum information, and specifically relates to a method for generating two-photon radiation based on a single quantum dot. Efficient generation of two-photon radiation using single-quantum dot double-exciton states by eliminating the effects of nonradiative Auger recombination. Background technique [0002] Quantum dots are semiconductor nanoparticles that confine excitons to three-dimensional space. They have the advantages of wide absorption spectrum, narrow emission spectrum and high quantum yield. They have broad applications in fluorescence imaging, new optoelectronic devices and quantum information. application prospects. Double excitons or multiple excitons exist in a single quantum dot at the same time. This multiple exciton state plays an important role in various optoelectronic devices based on quantum dots, such as light-emitting diodes, photodetectors, solar cells, and photon pair sources. . [000...

AI Technical Summary

Problems solved by technology

In addition, although the quantum dots will generate more biexcitons or multiple excitons under the excitation of high-power lasers, the excitons in the quantum dots will easily undergo Auger ionization to charge the quantum dots and hinder the two-photon of the quantum dots. radiation

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