Tapered fiber coupling of single defect centers in two-dimensional materials

Efficient extraction of photons from quantum emitters is an important prerequisite for the use of such emitters in quantum optical applications such as single photons sources or quantum enhanced sensors. There exist different approached to collect the photons, ranging from nigh numerical aperture microscope objectives over integrated on-chip waveguides and cavities to micro-mirrors. For real-world applications, it is also not enough to just collect the photons with the collection optics, it also needs to be ensured that the photons are channelled into a useful spatial mode, usually in an optical fiber.