A question of reality — ScienceDaily

Physicist Reinhold Bertlmann of the University of Vienna, Austria has printed a assessment of the get the job done of his late prolonged-term collaborator John Stewart Bell of CERN, Geneva in EPJ H. This assessment, ‘Real or Not Genuine: that is the question’, explores Bell’s inequalities and his ideas of truth and points out their relevance to quantum information and facts and its apps.

John Stewart Bell’s eponymous theorem and inequalities established out, mathematically, the contrast between quantum mechanical theories and neighborhood realism. They are utilized in quantum information and facts, which has evolving apps in stability, cryptography and quantum computing.

The distinguished quantum physicist John Stewart Bell (1928-1990) is finest known for the eponymous theorem that proved present-day knowledge of quantum mechanics to be incompatible with neighborhood concealed variable theories. Thirty years right after his death, his prolonged-standing collaborator Reinhold Bertlmann of the University of Vienna, Austria, has reviewed his pondering in a paper for EPJ H, ‘Real or Not Genuine: That is the question’. In this historic and private account, Bertlmann aims to introduce his readers to Bell’s ideas of truth and contrast them with some of his very own concepts of virtuality.

Bell used most of his operating lifestyle at CERN in Geneva, Switzerland, and Bertlmann initially achieved him when he took up a short-term fellowship there in 1978. Bell experienced initially offered his theorem in a seminal paper printed in 1964, but this was mostly neglected until eventually the eighties and the introduction of quantum information and facts.

Bertlmann discusses the concept of Bell inequalities, which arise by believed experiments in which a pair of spin-½ particles propagate in reverse instructions and are calculated by independent observers, Alice and Bob. The Bell inequality distinguishes between neighborhood realism — the ‘common sense’ watch in which Alice’s observations do not depend on Bob’s, and vice versa — and quantum mechanics, or, exclusively, quantum entanglement. Two quantum particles, this sort of as individuals in the Alice-Bob problem, are entangled when the condition calculated by just one observer instantaneously influences that of the other. This concept is the basis of quantum information and facts.

And quantum information and facts is no longer just an abstruse concept. It is discovering apps in fields as assorted as stability protocols, cryptography and quantum computing. “Bell’s scientific legacy can be seen in these, as effectively as in his contributions to quantum field concept,” concludes Bertlmann. “And he will also be remembered for his critical believed, honesty, modesty and aid for the underprivileged.”

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