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Journal of the Chinese Chemical Society

Scaled Fourier Transforms and Heisenberg’s Uncertainty Principle

Donald Jack Kouri

Published Jun 12, 2015• 1 citation
Publisher

Abstract

Abstract At the recent QSCP XIX, the author claimed a procedure of using a scaled Fourier transform (the scaling being determined by the detailed interaction and particle mass for a harmonic oscillator) to achieve simultaneous resolution of position and momentum greater than the standard Heisenberg value of 1/2. The procedure, while correct for digital signal processing, is, in fact, invalid for quantum mechanics. The purpose of this paper is simply to give the correct analysis of the uncertainty product, thereby clarifying the error made.

DOI
10.1002/jccs.201500039

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Abstract At the recent QSCP XIX, the author claimed a procedure of using a scaled Fourier transform (the scaling being determined by the detailed interaction and particle mass for a harmonic oscillator) to achieve simultaneous resolution of position and momentum greater than the standard Heisenberg value of 1/2. The procedure, while correct for digital signal processing, is, in fact, invalid for quantum mechanics. The purpose of this paper is simply to give the correct analysis of the uncertainty product, thereby clarifying the error made.
Heisenberg’s uncertainty principle establishes a fundamental restriction on the simultaneous resolution of certain pairs of quantum observables. In its familiar position–momentum form, the standard deviations of position and momentum satisfy a lower bound determined by the reduced Planck constant. This physical restriction, however, is distinct from the computational problem of resolving an uncertainty state from incomplete, discrete, noisy, or progressively acquired observational data. This paper explores the latter problem through the lens of a Calculus of Uncertainty, or CoU. The CoU framework considered here begins with partial data and applies a recursive reconstruction procedure consisting of rectangular approximation, trapezoidal approximation, midpoint approximation, numerical refinement, bounded logistic formulation, validation, and recursive state resolution. Applied to the uncertainty principle, this procedure does not attempt to recover simultaneously exact values of incompatible observables, nor does it modify the quantum-mechanical lower bound. Instead, it reconstructs estimates of the statistical moments of position and momentum distributions from partial observations, derives corresponding estimates of their standard deviations, evaluates those estimates relative to the uncertainty relation, and recursively determines whether the resulting state is sufficiently supported to be accepted. A distinction is therefore maintained between quantum uncertainty, which is a property of the admissible statistical structure of a quantum state, and reconstruction uncertainty, which arises from partial sampling, numerical approximation, truncation, measurement limitations, and incomplete contextual information. The proposed formulation treats the uncertainty relation as a constraint within the CoU context and validation structure. A state may be accepted only when its numerical reconstruction has converged to a specified tolerance and its estimated uncertainty product remains consistent with the quantum-mechanical lower bound. The resulting approach provides a tolerance-aware, constraint-consistent method for representing how an inferred state develops as additional evidence is acquired, approximations are refined, and prior states are recursively revised or retained. A worked minimum-uncertainty Gaussian reconstruction demonstrates that quadrature may converge accurately on a truncated domain while the reconstructed uncertainty product remains inadmissible until sufficient distributional mass is captured. **Keywords:** Calculus of Uncertainty, Heisenberg uncertainty principle, quantum uncertainty, partial data, numerical reconstruction, midpoint rule, logistic state formulation, recursive state resolution
This article establishes the proof of the Schrödinger equation for numerous quantum systems, utilizing Heisenberg's uncertainty principle. The Fourier transform connects functions in the time and frequency domains, resulting in the mathematical inequality that is the foundation of the uncertainty principle. In the part of Methods and Theory, the article derives the uncertainty principle through Fourier transforms by defining the mean and variance of angular frequency and time, and subsequently expanding the integral. This establishes the fundamental connection between time and frequency domains, illustrating the constraints imposed by quantum mechanics. In the part of Results and Application, the article applies the uncertainty principle to derive the Schrödinger equation under different conditions: free particle, particle in a box, harmonic oscillator, and hydrogen atom. For each case, the article assumes wave function solutions, uses the uncertainty in position and momentum to estimate kinetic and potential energies, and shows that the total energy matches the ground state energy derived from the Schrödinger equation. The results highlight the critical role of Heisenberg's uncertainty principle in understanding key aspects of quantum mechanics, providing a unified framework for these diverse systems.
This article establishes the proof of the Schrdinger equation for numerous quantum systems, utilizing Heisenberg's uncertainty principle. The Fourier transform connects functions in the time and frequency domains, resulting in the mathematical inequality that is the foundation of the uncertainty principle. In the part of Methods and Theory, the article derives the uncertainty principle through Fourier transforms by defining the mean and variance of angular frequency and time, and subsequently expanding the integral. This establishes the fundamental connection between time and frequency domains, illustrating the constraints imposed by quantum mechanics. In the part of Results and Application, the article applies the uncertainty principle to derive the Schrdinger equation under different conditions: free particle, particle in a box, harmonic oscillator, and hydrogen atom. For each case, the article assumes wave function solutions, uses the uncertainty in position and momentum to estimate kinetic and potential energies, and shows that the total energy matches the ground state energy derived from the Schrdinger equation. The results highlight the critical role of Heisenberg's uncertainty principle in understanding key aspects of quantum mechanics, providing a unified framework for these diverse systems.
oday the so-called Copenhagen Interpretation of quantum mechanics dominated description of the physical world still denies the possibility to assign exact simultaneous values to (all) physical quantities. A prime example is claimed to be the fundamental and universal relationship between position and momentum of a particle. According to Heisenberg's quantum mechanical uncertainty principle for position and momentum, the more precisely the momentum (position) of a particle is given, the less precisely can one say what its position (momentum) is and vice versa.\nThe purpose of this publication is to provide a mathematical proof that Heisenberg's uncertainty principle for position and momentum is refuted under any circumstances. As we shall see, accept Heisenberg's uncertainty principle as valid then you must accept too that +0 = +1, which is a logical contradiction. Thus far, it is possible to derive a logical contradiction out of Heisenberg's uncertainty principle. Heisenberg's uncertainty principle is refuted.
The Heisenberg uncertainty principle is a consequence of the postulate that coordinate and momentum representations are related to each other by the Fourier transform. This postulate has been accepted from the beginning of quantum theory by analogy with classical electrodynamics. We argue that the postulate is based neither on strong theoretical arguments nor on experimental data. A position operator proposed in our recent publication resolves inconsis-tencies of standard approach and sheds a new light on important problems of quantum theory. We do not assume that the reader is an expert in the given field and the content of the paper can be understood by a wide audience of physicists.