Quantum dots created with droplet-etching emit C-band optical light

Researchers from the University of Paderborn have successfully manufactured quantum dots that glow in the optical C-band, which is relevant for innovative encryption systems involving quantum technologies. The quantum dots were made by filling droplet-etched holes in an indium aluminum arsenide surface with indium gallium arsenide, lattice-matched to indium phosphide substrates. The team statistically evaluated and examined the symmetry of numerous holes manufactured using different parameters. The method is already demonstrating its potential for manufacturing quantum dots, which could be used as a source of entangled photons in the future.