Violation of Bell’s Inequalities and the Idea of a Quantum Computer

Dear Colleagues,

Quantum mechanics is considered fairly to be the most successful theory of physics. But this theory arose as a result of fierce disputes between its creators, Planck, Einstein, Schrodinger, and others, on the one hand, and Bohr, Heisenberg, Dirac, and others, on the other hand. The quantum debate between Einstein and Bohr resulted in the emergence of the idea of quantum computation and modern controversy about the violation of Bell’s inequalities. Alain Aspect stated in his Viewpoint published in Physics 8, 123 (2015): "By closing two loopholes at once, three experimental tests of Bell’s inequalities remove the last doubts that we should renounce local realism. They also open the door to new quantum information technologies". The title of this Viewpoint "Closing the Door on Einstein and Bohr’s Quantum Debate" implies the completion of the quantum debate. But the discussions about Bell’s inequalities indicate that the quantum debate is far from over. Alain Aspect connects fairly the possibility of new quantum information technologies, in particular quantum computation, with the renouncement of realism, since these technologies are based on the EPR correlation, the most paradoxical quantum principle that contradicts realism. But here the question arises whether it is possible to create a real device, a quantum computer, based on the principle that contradicts realism. Numerous experimental violation of Bell's inequalities are considered to be evidence of the EPR correlation. Therefore, the unfinished quantum debate about Bell's inequalities is connected with the question about the reality of a quantum computer. This connection highlights the relevance of this Special Issue on "Violation of Bell’s inequalities and the idea of a quantum computer" in which different perspectives on the violation of Bell's inequalities and the reality of a quantum computer should be presented. The questions of the Issue concern a wide range of problems in physics, mathematics, philosophy, and even the history of quantum mechanics. The latter is important, since the problem of Bell's inequality and the idea of a quantum computer are difficult to understand correctly without knowing the history of creation and controversies about quantum mechanics. Philosophy is important in connection with the question of the possibility of refuting realism.

Dr. Alexey Nikulov
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Entropy is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.