Core-shell Mie resonant structures for quantum computing applications

Quantum communications have garnered an increasing amount of interest over the last several years. One of the key components, a deterministic singlephoton source, requires both high quantum efficiency and suitable emission wavelengths, particularly for ubiquitous fiber-based systems. Solid state singlephoton sources, comprised of a crystal with isolated, optically active defects, are particularly advantageous in terms of their potential for fine control, reproducibility, ease of operation, and scalability. However, random orientation of single defects presents challenges in terms of scalable manufacturing of such sources. In this paper, we numerically demonstrate Mieresonant core –shellstructures that are to a large degree insensitive to random impurity dipole orientations and at the same time decouple spurious decay channels by enhancing both absorption and emission rates. Applying the simple core-shell design to Xenon-related color centers indiamondnanocrystals enhances emission rates into the main zero phonon line by a factor of 23 relative to the bulkdiamond. Addition of a Bragg-mirror shell to the Mie core-shell permits a great deal of further increase in the enhancement factor: e.g., a factor of 1273 for a two-bilayerBragg mirror. A great deal of insensitivity to both the emitting dipole orientation and positioning within thenanocrystal was demonstrated.

Source: Applied Physics Letters - November 29, 2016 Category: Physics Authors: Roman Shugayev and Peter Bermel Source Type: research