Reality and the main question of quantum information

Dirk Bouwmeester, ARTUR K. EKERT, Anton Zeilinger

Ge Meng, Wang Yao-de

A brief review of the main ideas (interpretations) of quantum mechanics is given. Each of the considered interpretations contains a number of disputable provisions, the discussion of which allows us to develop our own understanding of the mechanism of paradoxical quantum phenomena. The article is addressed to all students who study the concepts of modern natural science, and to all readers interested in the questions what is the reality beyond the quantum mechanical experiment or if our perception really shapes the physical world in some way. The author believes that the development of quantum information technologies is impossible without answering these fundamental questions.

Tarek Nouioua, Belbachir Ahmed Hafid

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.

Antoine Browaeys

Bernard d’Espagnat

This chapter tries to pinpoint the epistemological information that a scientist (or an epistemologist) anxious to keep away from "metaphysical" commitments of any sort may nevertheless derive from quantum physics. But, valuable as it is (mainly as a guide for discriminating the genuinely scientific questions from those of a more "mixed" sort) this standpoint is not to be raised to the status of a universal way of thinking that would be the only admissible one. Within the veiled reality conception Einstemian separability, applies to empirical, not to independent, reality; which means that special relativity theory does not concern independent reality. In his mature years Heisenberg developed a conception of the world in which quite a central role is played by the notion of potentia. He associated wave functions to potentia. In a sense, Heisenberg's approach is ontological, but his ontology is of a subtle kind, for along with actuality it leaves room for potentialities.

Sonja Smets