Jr. Klauder, COHERENT STATES AND COORDINATE-FREE QUANTIZATION, Zeitschrift fur Naturforschung. A, A journal of physical sciences, 52(1-2), 1997, pp. 69-75
The usual quantization procedures interpret canonical transformations
in an active way linking them with unitary transformations, while the
quantization procedure offered by coherent states completely separates
classical canonical transformations and unitary operator transformati
ons. By exploiting this property, along with a physically motivated sh
adow metric, it is seen how to realize the quantization process in as
coordinate-free a form as holds in classical mechanics.