Zz. Xin et al., COMPLETENESS RELATION OF THE EIGENSTATES OF THE POWERS OF THE RADIATION-FIELD AMPLITUDE, Physical review. A, 50(5), 1994, pp. 4419-4421
The completeness relation of the eigenstates of the operator a(k), k=2
,3,4,..., a being the annihilation operator of the radiation field, is
discussed. Through a modification of the normalization factor of the
eigenstate of a(k), proposed by several authors including Sun, Wang, a
nd Wang [Phys. Rev. A 44, 3369 (1991)], the correct completeness relat
ion is proposed.