Preparation method of optical fiber NV color center single/multi-photon source

Abstract

The invention discloses a preparation method of an optical fiber type NV color center single / multiphoton source. Diamond nanoparticles containing a NV color center are used as a luminescent medium, tellurite glass is prepared by a melt quenching method, the trace diamond nanoparticles are injected into glass liquid, fiber core glass is prepared, an optical fiber doped with NV color center diamondnanoparticles is drawn, and the NV color center is excited by a 532 nm solid laser to prepare the optical fiber type NV color center multiphoton source. On this basis, the multiphoton fiber with multiple color centers can be repeatedly cut in half and detected to prepare the optical fiber NV color center single photon source. The preparation method has low preparation cost, strong reliability andhigh portability.

Description

technical field [0001] The invention relates to a preparation method of a photon source, in particular to a preparation method of an optical fiber NV color center single / multi-photon source. Background technique [0002] The diamond NV color center (nitrogen-vacancy center) is composed of a nitrogen atom occupying the diamond lattice and a vacancy in the adjacent lattice position. The lattice structure is as follows figure 1 shown. As an excellent single-photon source at room temperature, a single NV color center has high quantum fluorescence yield and stability, and has important applications in the fields of quantum secure communication, super-resolution imaging, quantum detection, and quantum computing. [0003] At present, confocal microscopy is commonly used to locate a single NV color center for photon excitation. This confocal microscopy system requires an ultra-high-precision microscopic imaging system and a nanoscale scanning system, which has low portability and i...

AI Technical Summary

Problems solved by technology

[0003] At present, confocal microscopy is commonly used to locate a single NV color center for photon excitation. This confocal microscopy system requires an ultra-high-precision microscopic imaging system and a nanoscale scanning system, which has low portability and is difficult to Transplanted into external field systems such as low temperature, magnetic field and electric field, and need to reposition after replacing the color center, it takes a lot of manpower and material resources

In addition, the collection efficiency of the photons emitted by the diamond NV color center is very low, only a small part of the photons are refracted on the diamond surface and collected by the objective lens, and most of the photons are totally reflected on the diamond surface. Considering the coupling and quantum efficiency of the detector, the photon The detection efficiency is less than 2%

Although the photon collection efficiency can be improved by using the side collection technology, four photodetectors are used to collect photons from around the diamond particles, and the collection efficiency is increased to 47%, but the cost of this solution is high, and the collection efficiency still needs to be improved

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