FROM THE QUBIT TO THE QUANTUM SEARCH ALGORITHMS

The main topic of this paper is to introduce the Quantum Information theory, emphasizing its good properties, but also clarifying common misunderstandings. Quantum Information theories and technologies have indeed many positive and interesting features, and hold promises of great developments. However, there are also problems. At present time, we can count a very small number of quantum algorithms, for example Quantum Fourier Transform, Shor's and Grover's. Grover's Algorithm in particular is capable of accelerating the search of elements in a large database. In our opinion, future evolutions of such algorithms will be successfully applied to the world of data handling, for example to satisfy astronomical needs when its time resolution capabilities will be pushed toward Heisenberg quantum limit.