Symplectic quantization, inequivalent quantum theories, and Heisenberg's principle of uncertainty

Details Symplectic quantization, inequivalent quantum theories, and Heisenberg's principle of uncertainty Symplectic quantization, inequivalent quantum theories, and Heisenberg's principle of uncertainty

2004-07-06

arxiv.org/abs/quant-ph/0407051v1

Phys.Rev. A70 (2004) 032104

Physics

Quantum Physics

8 pages, LaTex file, no figures. Accepted for publication in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.70.032104

We analyze the quantum dynamics of the non-relativistic two-dimensional isotropic harmonic oscillator in Heisenberg's picture. Such a system is taken as toy model to analyze some of the various quantum theories that can be built from the application of Dirac's quantization rule to the various symplectic structures recently reported for this classical system. It is pointed out that that these quantum theories are inequivalent in the sense that the mean values for the operators (observables) associated with the same physical classical observable do not agree with each other. The inequivalence does not arise from ambiguities in the ordering of operators but from the fact of having several symplectic structures defined with respect to the same set of coordinates. It is also shown that the uncertainty relations between the fundamental observables depend on the particular quantum theory chosen. It is important to emphasize that these (somehow paradoxical) results emerge from the combination of two paradigms: Dirac's quantization rule and the usual Copenhagen interpretation of quantum mechanics.

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