Physics – Quantum Physics
Scientific paper
1994-12-28
Annals Phys. 244 (1995) 101-111
Physics
Quantum Physics
13 pages, TeX
Scientific paper
A general formlulation for discrete-time quantum mechanics, based on Feynman's method in ordinary quantum mechanics, is presented. It is shown that the ambiguities present in ordinary quantum mechanics (due to noncommutativity of the operators), are no longer present here. Then the criteria for the unitarity of the evolution operator is examined. It is shown that the unitarity of the evolution operator puts restrictions on the form of the action, and also implies the existence of a solution for the classical initial-value problem.
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