Other future quantum dot applications oanti counterfeiting capabilities inject dots into liquid mixtures fabrics polymer matrices etc ability to specifically control absorption and emission spectra to produce unique validation signatures almost impossible to mimic with traditional semi conductors. The colloidal quantum dots are irradiated with ultraviolet light due to quantum confinement quantum dots of different sizes emit light of different colors quantum dots are very small. Quantum dots are small devices that contain a tiny droplet of free electrons they are fabricated in semiconductor materials and have typical dimensions ranging from nanometres to a few micronsthe size and shape of these structures and therefore the number of electrons they contain can be precisely controlled a quantum dot can have anything from a single electron to a collection of several . Computing quantum dot technology is one of the most promising candidates for use in solid state quantum computation by applying small voltages to the leads the flow of electrons through the quantum dot can be controlled and thereby precise measurements of the spin and other properties therein can be made with several entangled quantum dots or qubits plus a way of performing operations quantum calculations and the computers that would perform them might be possible