Fast identification method for single quantum dot

A single quantum dot and quantum dot technology, applied in the field of rapid identification of single quantum dots, can solve problems such as inability to distinguish single quantum dots

Active Publication Date: 2018-08-10
SHANXI UNIV
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Problems solved by technology

Quantum dots with higher biexciton quantum yields are impossible to identify using the conventional second-order correlation function method, because the stronger two-photon radiation produced by the biexciton state can lead to the intermediate peak g of the second-order correlation function 2 The (0) value is quite high, making it impossible to distinguish single quantum dots

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  • Fast identification method for single quantum dot
  • Fast identification method for single quantum dot
  • Fast identification method for single quantum dot

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Embodiment Construction

[0025] First prepare the quantum dot sample, and spin-coat the toluene solution of CdSe / ZnS core / shell alloy quantum dots with a concentration of about 10-10 M on the surface of a clean glass sheet, wherein the spin-coating speed is 2000 rpm, and the spin-coating time is 1 minute. The fluorescence emission wavelength peak of the CdSe / ZnS core / shell alloy quantum dot is 615nm, and the quantum yield is about 80%. The quantum dot sample is placed on the stage for rapid identification of single quantum dots.

[0026] The device involved in this embodiment mainly includes three main parts: 1) confocal scanning imaging system, 2) HBT detection system, and 3) time-correlated single photon counting system. The composition of the confocal scanning imaging system is as follows. The excitation light source is a picosecond pulsed laser (PDL808 PicoQuant) with a wavelength of 485 nm and a pulse repetition frequency of 10 MHz. beam expander; an inverted fluorescence microscope (Olympus, I...

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Abstract

The invention relates to the quantum information field, in particular to a fast identification method for single quantum dot. Directed at quantum dots with high biexciton quantum yield and fluorescence blinking, the fast identification method for single quantum dot effectively eliminates biexciton photon generated by biexciton state based on the characteristic that biexciton state has shorter lifetime than single exciton state. The novel quantum dots with high biexciton quantum yield can be used for preparation of correlated photon pair sources effectively, and can be used in quantum key distribution, quantum entanglement and other quantum information fields, wherein the fast identification of single quantum dot is crucial for preparation of correlated photon pair sources.

Description

technical field [0001] The invention relates to the field of quantum information, in particular to a method for quickly identifying single quantum dots. Background technique [0002] Quantum dots are semiconductor nanoparticles that confine excitons to a three-dimensional space. They have the advantages of extremely wide absorption lines, narrow emission lines, and high quantum yields. They are used in fluorescence imaging and new optoelectronic devices. It has broad application prospects in quantum information and other aspects. With the development of quantum synthesis and preparation technology, new quantum dots with higher double-exciton quantum yields have been successfully developed. This type of quantum dots can generate two-photons based on double-exciton states for carrier multiplication, optical amplification, The preparation of correlated photon pair sources is of great significance, and the efficient preparation of correlated photon pair sources can be used in q...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6402
Inventor 张国峰李斌陈瑞云秦成兵高岩肖连团贾锁堂
Owner SHANXI UNIV
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