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arXiv:quant-ph/0111130

Dialogue on Classical and Quantum between mathematician and experimenter

Andrei Yu. Khrennikov, Johann Summhammer

Published Nov 24, 2001• 4 citations
arXivHTMLPDF

Abstract

This dialogue took place at Växjö, 19 November 2001. The main aim of our meeting in Växjö was to clarify our viewpoints on foundations of quantum mechanics. The most attractive in our discussion was the extreme difference in our quantum experiences. On one side, pure mathematician (specializing in foundations of probability theory), Andrei Khrennikov; on the other side, pure experimenter (specializing in neutron and electron interferometry), Johann Summhammer. On one hand, an attempt to test mathematical models for larger and larger domains of physical reality. On the other hand, an attempt to create this reality from experimental information - roughly speaking from clicks of detectors.

DOI
10.48550/arxiv.quant-ph/0111130

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This dialogue took place at Växjö, 19 November 2001. The main aim of our meeting in Växjö was to clarify our viewpoints on foundations of quantum mechanics. The most attractive in our discussion was the extreme difference in our quantum experiences. On one side, pure mathematician (specializing in foundations of probability theory), Andrei Khrennikov; on the other side, pure experimenter (specializing in neutron and electron interferometry), Johann Summhammer. On one hand, an attempt to test mathematical models for larger and larger domains of physical reality. On the other hand, an attempt to create this reality from experimental information - roughly speaking from clicks of detectors.
This conference is one of a series of Vaxjo conferences on the foundations of quantummechanics. The main aim of this conference was to understand the role that probability plays in the foundations of physics, theoretical as well as experimental. It should be emphasized that nowadays the problems of probabilistic foundations are not of purely theoretical interest. These problems play a fundamental role in future development of quantum computing and cryptography. At this conference we were fortunate to have a mixture of outstanding physicists, mathematicians, and even philosophers interested in scientific foundations in attendance. The following problems were discussed: unification of classical and quantum probability theories, EPR-Bohm and theoriginal EPR experiments, Bell's inequality: interpretations of its violation and loopholes,simulation of EPR-Bohm correlations in the local realistic approach, nonlocality, contextual probabilistic models, subjective probability and quantum information, quantum logic, results of recent experiments in quantum information, philosophic foundations of probability and quantum mechanics, model theory, discrete time and dynamics.
This conference was devoted to fundamental questions raised by quantum mechanics, especially in quantum information theory. As has become customary in our series of conference in Vaxjo, we were glad to welcome a fruitful assembly of theoretical physicists, experimentalists, mathematicians and even philosophers interested in the foundations of probability and physics. This conference belongs to the series of Vaxjo conferences in foundations of quantum mechanics (especially probabilistic foundations) combined of two subseries, Foundations of Probability and Physics: 2000, 02, 04, 06, 08, and Quantum Theory: Reconsideration of Foundations: 2001, 03, 05, 07. We also mention the first Vaxjo conference: Bohmian mechanics 2000. This is definitely the longest series of conferences on foundations in the history of quantum mechanics.
The purpose of the conference (the fourth in the series of Vaxjo conferences) was to bring together scientists (physicists, mathematicians and philosophers) who are interested in foundations of quantum physics. An emphasis was made on both theory and experiment, the underlying objective being to offer to the physical, mathematical and philosophic communities a truly interdisciplinary conference as a privileged place for a scientific interaction. Due to the actual increased role of foundations in the development of quantum information theory as well as the necessity to reconsider foundations at the beginning of the new millennium, the organizers of the conference decided that it was just the right time for taking the scientific risk of trying this.
We attempt to contribute some novel points of view to the "foundations of quantum mechanics", using mathematical tools from "quantum probability theory" (such as the theory of operator algebras). We first introduce an abstract algebraic framework for the formulation of mathematical models of physical systems that is general enough to encompass classical and quantum mechanical models. After a short discussion on the properties of classical systems (realism and determinism), we move on to the study of a general class of quantum-mechanical models of physical systems and explain what some of the key problems in a quantum theory of observations and measurements are. In the last part of our essay, we attempt to elucidate the roles played by entanglement between a system and its environment and of information loss in understanding "decoherence" and "dephasing", which are key mechanisms in a quantum theory of measurements and experiments. We also discuss the problem of "time in quantum mechanics" and sketch an answer to the question when an experiment can be considered to have been completed successfully.