  As known, the cylindrical gravitational field (wave) have been canonically
quantized and its wave function, as the quantum one, interpreted in probability
terms. We show in this work, using quantum Zeno methods, that this probability
may be substantially increased and even approach unity. For that we first show,
in detailed manner, that the cylindrical gravitational field may be discussed
in the commutation number representation. We also discuss this field in the
transverse-traceless (TT) gauge and calculate the related trapped surface.
