Abstract
In this paper, some devices were reviewed to be used in quantum communications. We presented a low density of Quantum Dots, which could be used to get single quantum dot as light emitting source for generating single photons. An analytical model to study the thermal behavior of a solid media in interaction with one, two or three laser beams was developed using the classical heat equation. Integrated optic micro-ring resonators and its simulated result also are presented. Development of active micro-ring in silicon is at an early stage, where both vertical and horizontal techniques are feasible. With the epitaxy growth techniques, a possibility for achieving controllable QD density, size and good uniformity are proposed. A low density of QDs in range of 10<sup>8</sup> cm<sup>-2</sup> has demonstrated through successive adjustment of the growth parameters. Details among the devices are presented and discussed.
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