In this article we give a general introduction to problems of quantum information technology and quantum computing. In the basis of these new technologies there are quantum information bits, or so called qubits, which can be not only in basis states of "zero" and "one", but also in a quantum superposition of these states. There is much hope from scientists and engineers that quantum computers when they are created, will be essential in modeling quantum systems, as well as in solving some other problems that are can not be solved by classical computers.