Preparation method of photon-guiding single-photon source

Abstract

The invention provides a method for preparing a photon-guided single-photon source, which includes: positioning the position of the color center in the diamond block; using multiple sets of circular ion beam pattern groups to etch the color center on the surface of the diamond block is the hemispherical surface of the center of the sphere, in each group of annular ion beam pattern groups, the ring centers of each annular ion beam pattern are staggered, the inner circle radii of each annular ion beam pattern are equal, and the outer circle radii of each annular ion beam pattern are equal, And the ring centers of each annular ion beam pattern are evenly distributed on a circle, the inner radius of each group of annular ion beam patterns gradually decreases until approaching 0, and the outer radius of each group of annular ion beam patterns gradually increases, so that the diamond The side wall forming the surrounding hemisphere in the block is a parabola, and the color center is located at the focus of the parabola. The invention can significantly improve the single-photon collection and utilization efficiency of the diamond single-photon source, and enables the diamond single-photon source to have photon guidance.

Description

technical field [0001] The invention relates to the field of micro-nano device processing technology and the field of quantum information technology, in particular, the invention relates to a preparation method of a photon-guiding single-photon source. Background technique [0002] The photon as a quantum entity has played an important role in opening understanding of the quantum world. Among them, a single-photon source capable of emitting a single photon is a major quantum platform. [0003] At present, most of the systems that can controllably emit single photons are single-emitter quantum systems, which include: semiconductor quantum dots, mesoscopic quantum wells, single molecules, single atoms and single ions, and NV color centers (nitrogen substitution in diamond color centers combined with adjacent vacancy defects, hereinafter referred to as color centers), etc. Its operating principle is: when a single photon needs to be emitted, the system enters an excited state...

AI Technical Summary

Problems solved by technology

However, the precision of direct etching with focused ion beams is still limited, and the single-photon collection and utilization efficiency of the diamond hemispherical lens prepared by this scheme is still to be improved, which is far from the theoretical value.

Although the diamond hemispherical lens structure prepared by micro-nano processing technology can reduce the internal reflection of the emitted single photon in the bulk material and effectively improve the collection efficiency, but due to the blocking of the substrate sidewall around the hemispherical structure, a large part of it exits from the hemispherical lens. of single photons still cannot be collected by single photon collectors

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