Quantum hocus-pocus

Svozil, Karl

doi:10.3354/esep00171

Cited by 17 publications

(11 citation statements)

References 34 publications

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“…In this unappealing interpretation there are no mysterious influences and an outcome of Alice's measurement does not give immediate exact knowledge about Bob's outcome. One has to understand it well if one wants to construct a scalable superfast quantum computer using EPR pairs [106,107].…”

Section: Discussionmentioning

confidence: 99%

Is Einsteinian no-signalling violated in Bell tests?

Kupczyński

2017

Open Physics

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Relativistic invariance is a physical law verified in several domains of physics. The impossibility of faster than light influences is not questioned by quantum theory. In quantum electrodynamics, in quantum field theory and in the standard model relativistic invariance is incorporated by construction. Quantum mechanics predicts strong long range correlations between outcomes of spin projection measurements performed in distant laboratories. In spite of these strong correlations marginal probability distributions should not depend on what was measured in the other laboratory what is called shortly: nonsignalling. In several experiments, performed to test various Bell-type inequalities, some unexplained dependence of empirical marginal probability distributions on distant settings was observed . In this paper we demonstrate how a particular identification and selection procedure of paired distant outcomes is the most probable cause for this apparent violation of no-signalling principle. Thus this unexpected setting dependence does not prove the existence of superluminal influences and Einsteinian no-signalling principle has to be tested differently in dedicated experiments. We propose a detailed protocol telling how such experiments should be designed in order to be conclusive. We also explain how magical quantum correlations may be explained in a locally causal way.Keywords: EPR paradox and Bell inequalities, parameter independence and non-signalling, new unambiguous tests of Einsteinian no-signalling, quantum nonlocality demystified, causally local explanation of quantum correlations

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Section: Discussionmentioning

confidence: 99%

Is Einsteinian no-signalling violated in Bell tests?

Kupczyński

2017

Open Physics

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“…Nevertheless, speculations about quantum nonlocality and quantum magic are still quite frequent in blogs, books, and scientific papers. Such unfounded speculations are not only motivated by the violation of Bell inequalities but also by incorrect interpretations of quantum mechanics, as it was clearly explained in several recent papers [ 53 , 54 , 55 , 66 , 67 , 68 , 69 , 70 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 ].…”

Section: Introductionmentioning

confidence: 99%

Contextuality-by-Default Description of Bell Tests: Contextuality as the Rule and Not as an Exception

Kupczyński

2021

Entropy

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Contextuality and entanglement are valuable resources for quantum computing and quantum information. Bell inequalities are used to certify entanglement; thus, it is important to understand why and how they are violated. Quantum mechanics and behavioural sciences teach us that random variables ‘measuring’ the same content (the answer to the same Yes or No question) may vary, if ‘measured’ jointly with other random variables. Alice’s and Bob’s raw data confirm Einsteinian non-signaling, but setting dependent experimental protocols are used to create samples of coupled pairs of distant ±1 outcomes and to estimate correlations.Marginal expectations, estimated using these final samples, depend on distant settings. Therefore,a system of random variables ‘measured’ in Bell tests is inconsistently connected and it should be analyzed using a Contextuality-by-Default approach, what is done for the first time in this paper.The violation of Bell inequalities and inconsistent connectedness may be explained using a contextual locally causal probabilistic model in which setting dependent variables describing measuring instruments are correctly incorporated. We prove that this model does not restrict experimenters` freedom of choice which is a prerequisite of science. Contextuality seems to be the rule and not an exception; thus, it should be carefully tested.

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“…Apart from obviously requesting more resources to the society at large, we believe that extra-resources on parallel designs as the one sketched here could be available once a consistent part of the scientific community will acknowledge where the most urgent, impactful priorities are. In this regard, it is reasonable to expect that the currently disproportionate emphasis on quantum information technologies -mainly driven by military and finance secrecy issues -will fade away, especially once researchers will recognize the large ratio between promised and delivered results [22]. A balanced transfer of human and financial resources from quantum information technology to research in controlled plasma fusion will be highly beneficial for our unique and irreplaceable Planet Earth.…”

Section: Discussionmentioning

confidence: 99%

Concepts for a Deuterium–Deuterium Fusion Reactor

Onofrio

2018

J. Exp. Theor. Phys.

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We revisit the assumption that reactors based on deuterium-deuterium (D-D) fusion processes have to be necessarily developed after the successful completion of experiments and demonstrations for deuterium-tritium (D-T) fusion reactors. Two possible mechanisms for enhancing the reactivity are discussed. Hard tails in the energy distribution of the nuclei, through the so-called κ-distribution, allow to boost the number of energetic nuclei available for fusion reactions. At higher temperatures than usually considered in D-T plasmas, vacuum polarization effects from real e + e − and µ + µ − pairs may provide further speed-up due to their contribution to screening of the Coulomb barrier. Furthermore, the energy collection system can benefit from the absence of the lithium blanket, both in simplicity and compactness. The usual thermal cycle can be bypassed with comparable efficiency levels using hadronic calorimetry and third-generation photovoltaic cells, possibly allowing to extend the use of fusion reactors to broader contexts, most notably maritime transport.

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Quantum hocus-pocus

Cited by 17 publications

References 34 publications

Is Einsteinian no-signalling violated in Bell tests?

Is Einsteinian no-signalling violated in Bell tests?

Contextuality-by-Default Description of Bell Tests: Contextuality as the Rule and Not as an Exception

Concepts for a Deuterium–Deuterium Fusion Reactor

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