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Search Results: 1 - 10 of 173342 matches for " De Raedt "
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Counterfactual Definiteness and Bell’s Inequality  [PDF]
Karl Hess, Hans De Raedt, Kristel Michielsen
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.713150
Abstract: Counterfactual definiteness must be used as at least one of the postulates or axioms that are necessary to derive Bell-type inequalities. It is considered by many to be a postulate that not only is commensurate with classical physics (as for example Einstein’s special relativity), but also separates and distinguishes classical physics from quantum mechanics. It is the purpose of this paper to show that Bell’s choice of mathematical functions and independent variables implicitly includes counterfactual definiteness. However, his particular choice of variables reduces the generality of his theory, as well as the physics of all Bell-type theories, so significantly that no meaningful comparison of these theories with actual Einstein-Podolsky-Rosen experiments can be made.
Analysis of Wigner’s Set Theoretical Proof for Bell-Type Inequalities  [PDF]
Karl Hess, Hans De Raedt, Kristel Michielsen
Journal of Modern Physics (JMP) , 2017, DOI: 10.4236/jmp.2017.81005
Abstract: We present a detailed analysis of the set theoretical proof of Wigner for Bell type inequalities with the following result. Wigner introduced a crucial assumption that is not related to Einstein’s local realism, but instead, without justification, to the existence of certain joint probability measures for possible and actual measurement outcomes of Einstein-Podolsky-Rosen (EPR) experiments. His conclusions about Einstein’s local realism are, therefore, not applicable to EPR experiments and the contradiction of the experimental outcomes to Wigner’s results has no bearing on the validity of Einstein’s local realism.
Event-by-event simulation of quantum phenomena
De Raedt, H.;
Brazilian Journal of Physics , 2008, DOI: 10.1590/S0103-97332008000100006
Abstract: in this talk, i discuss recent progress in the development of simulation algorithms that do not rely on any concept of quantum theory but are nevertheless capable of reproducing the averages computed from quantum theory through an event-by-event simulation. the simulation approach is illustrated by applications to single-photon mach-zehnder interferometer experiments and einstein-podolsky-rosen-bohm experiments with photons.
Building the Rainbow Nation: A critical analysis of the role of architecture in materializing a post-apartheid South African identity
De Raedt, Kim
Afrika Focus , 2012,
Abstract: Soon after apartheid was abolished in 1994, the quest for a new, ‘authentic’ South African identity resulted in the emergence of the "Rainbow Nation" idea, picturing an equal, multicultural and reconciled society. As architecture is considered a crucial element in the promotion of this Rainbow identity, the country witnessed a remarkable "building boom" with its apogee roughly between 1998 and 2010. Huge investments have been made in state-driven projects which place the apartheid memory at the center of the architectural debate – mostly museums and memorials. However, the focus of this paper shall lie on another, less highlighted tendency in current architectural practice. This paper demonstrates that, through the construction of urban community services, South African architects attempt to materialize the Rainbow Nation in a way that might be closer to the everyday reality of society.
Event-by-event simulation of quantum phenomena
H. De Raedt
Physics , 2007,
Abstract: In this talk, I discuss recent progress in the development of simulation algorithms that do not rely on any concept of quantum theory but are nevertheless capable of reproducing the averages computed from quantum theory through an event-by-event simulation. The simulation approach is illustrated by applications to single-photon Mach-Zehnder interferometer experiments and Einstein-Podolsky-Rosen-Bohm experiments with photons.
Efficient data processing and quantum phenomena: Single-particle systems
H. De Raedt,K. De Raedt,K. Michielsen,S. Miyashita
Physics , 2005, DOI: 10.1016/j.cpc.2005.12.013
Abstract: We study the relation between the acquisition and analysis of data and quantum theory using a probabilistic and deterministic model for photon polarizers. We introduce criteria for efficient processing of data and then use these criteria to demonstrate that efficient processing of the data contained in single events is equivalent to the observation that Malus' law holds. A strictly deterministic process that also yields Malus' law is analyzed in detail. We present a performance analysis of the probabilistic and deterministic model of the photon polarizer. The latter is an adaptive dynamical system that has primitive learning capabilities. This additional feature has recently been shown to be sufficient to perform event-by-event simulations of interference phenomena, without using concepts of wave mechanics. We illustrate this by presenting results for a system of two chained Mach-Zehnder interferometers, suggesting that systems that perform efficient data processing and have learning capability are able to exhibit behavior that is usually attributed to quantum systems only.
Number Partitioning on a Quantum Computer
H. De Raedt,K. Michielsen,K. De Raedt,S. Miyashita
Physics , 2000, DOI: 10.1016/S0375-9601(01)00680-6
Abstract: We present an algorithm to compute the number of solutions of the (constrained) number partitioning problem. A concrete implementation of the algorithm on an Ising-type quantum computer is given.
Deterministic event-based simulation of quantum interference
K. De Raedt,H. De Raedt,K. Michielsen
Physics , 2004, DOI: 10.1016/j.cpc.2005.04.012
Abstract: We propose and analyse simple deterministic algorithms that can be used to construct machines that have primitive learning capabilities. We demonstrate that locally connected networks of these machines can be used to perform blind classification on an event-by-event basis, without storing the information of the individual events. We also demonstrate that properly designed networks of these machines exhibit behavior that is usually only attributed to quantum systems. We present networks that simulate quantum interference on an event-by-event basis. In particular we show that by using simple geometry and the learning capabilities of the machines it becomes possible to simulate single-photon interference in a Mach-Zehnder interferometer. The interference pattern generated by the network of deterministic learning machines is in perfect agreement with the quantum theoretical result for the single-photon Mach-Zehnder interferometer. To illustrate that networks of these machines are indeed capable of simulating quantum interference we simulate, event-by-event, a setup involving two chained Mach-Zehnder interferometers. We show that also in this case the simulation results agree with quantum theory.
New method to simulate quantum interference using deterministic processes and application to event-based simulation of quantum computation
H. De Raedt,K. De Raedt,K. Michielsen
Physics , 2005, DOI: 10.1143/JPSJS.74S.16
Abstract: We demonstrate that networks of locally connected processing units with a primitive learning capability exhibit behavior that is usually only attributed to quantum systems. We describe networks that simulate single-photon beam-splitter and Mach-Zehnder interferometer experiments on a causal, event-by-event basis and demonstrate that the simulation results are in excellent agreement with quantum theory. We also show that this approach can be generalized to simulate universal quantum computers.
Quantum Computer Emulator
Hans De Raedt,Anthony Hams,Kristel Michielsen,Koen De Raedt
Physics , 1999, DOI: 10.1016/S0010-4655(00)00132-6
Abstract: We describe a quantum computer emulator for a generic, general purpose quantum computer. This emulator consists of a simulator of the physical realization of the quantum computer and a graphical user interface to program and control the simulator. We illustrate the use of the quantum computer emulator through various implementations of the Deutsch-Jozsa and Grover's database search algorithm.
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