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Journal of Mathematical Physics

A q-analog of the quantum central limit theorem for SUq(2)

Romuald Lenczewski, Krzysztof Podgórski

Published Aug 1, 1992• 12 citations
Publisher

Abstract

A q-analog of the central limit theorem for SUq(2), q≳0, is studied. It is shown that the limits of the moments and q-exponential generating functions for coherent states give for q≳1 (0<q<1) the harmonic q-oscillator (q−1-oscillator) introduced by Biedenharn and Macfarlane.
DOI
10.1063/1.529546

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The finite q -oscillator is a model that obeys the dynamics of the harmonic oscillator, with the operators of position, momentum and Hamiltonian being functions of elements of the q -algebra su q (2). The spectrum of position in this discrete system, in a fixed representation j , consists of 2 j + 1 'sensor'-points , and similarly for the momentum observable. The spectrum of energies is finite and equally spaced, so the system supports coherent states. The wavefunctions involve dual q -Kravchuk polynomials, which are solutions to a finite-difference Schrödinger equation. Time evolution (times a phase) defines the fractional Fourier– q -Kravchuk transform. In the classical limit as q → 1 we recover the finite oscillator Lie algebra, the N = 2 j → ∞ limit returns the Macfarlane–Biedenharn q -oscillator and both limits contract the generators to the standard quantum-mechanical harmonic oscillator.
Nonlinearity of electromagnetic field vibrations described by q-oscillators is shown to produce essential dependence of second correlation functions on intensity and deformation of Planck distribution. Experimental tests of such nonlinearity are suggested. 1 on leave from Lebedev Physical Institute, Moscow 1 In the framework of investigations on quantum groups [1] the special case of the Heisenberg-Weyl algebra was first considered by Biedenharn [2] and Macfarlane [3]. They introduced ”q-oscillator operators ” starting from a deformed commutation relation containing a dimensionless parameter q. The physical sense of the quantun q-oscillator up to now was not clarified. In [4] a generalization to several modes has been analyzed. An attempt to connect quantum q-oscillator with relativistic oscillator model has been discussed in [5]. The q-oscillators and quantum group SUq(2) have also been considered