Luis Aina, AlfredoSánchez Soto, Luis Lorenzo2023-06-202023-06-201993-021050-294710.1103/PhysRevA.47.1492https://hdl.handle.net/20.500.14352/59836© 1993 The American Physical Society. We are much indebted to Professor E. Bernabeu for his continual advice and interest in the present work.An alternative derivation of the Pegg-Barnett phase operator is presented. This approach is based on the properties of the representation in quantum mechanics of a nonlinear nonbijective canonical transformation. It does not use as its starting point either a finite-dimensional space or the definition of phase states. The features of this formalism are analyzed in terms of this transformation.engjournal articlehttp://dx.doi.org/10.1103/PhysRevA.47.1492http://journals.aps.org/open access535QuantumStatesAngleÓptica (Física)2209.19 Óptica Física