# Modular system for fluorescence-based single photon generation using retro-reflector

## TL;DR

This paper introduces a modular fluorescence-based system for single photon generation that simplifies alignment, enhances stability, and enables practical long-duration photon streaming from nano-flake sources.

## Contribution

The authors developed a modular setup for single photon generation that improves alignment ease, stability, and scalability compared to traditional complex systems.

## Key findings

- Achieved stable single photon stream over an hour
- Enabled scalable output with multiple single mode fibers
- Maintained low fluctuation levels in photon count rate

## Abstract

Apparatus for fluorescence-based single photon generation includes collection optics and various setups for characterization. Managing this system often reveals complexity in such a way that adjusting in a small region changes optimal alignments of others. We suggest here a modular system, where the optimal alignment is given to each compartment and tested independently. Based on this concept, we built a system for single photon generation with fluorescence center in hexagonal boron nitride nano-flake, advantageous for scaling up the number of single mode fiber output and a high degree of stability. The system allowed for a practical use of single photon stream extended over an hour with a uniform count rate of small fluctuation levels.