The Quantum Computer and the Security of Information Systems

Many researchers and laboratories have been engaged for years in a competition for a single objective, which is the quantum computer. Recently, Google has announced that it has achieved quantum supremacy with its quantum computer "Sycamore". According to Google, such a machine can make an astronomical quantity of calculations considerably faster than any conventional computer. A technology which could be a real revolution in several domains, Computing, Experimentation Technics, Artificial Intelligence, Medical, Chemical, Banking...etc. But, the main question is: when can it be a reality? In the present paper, we will explore quantum phenomena and explain principles of quantum computer especially the qubit (quantum bit), to finally explain whether or not the quantum computer is a reality and could it be a danger for the information systems? We will explore the subject by presenting existing works, and by defining the framework of laws to achieve a quantum computer that may solves all our possible problems.