A q -deformed binomial theorem is firstly presented in this work. Some operator identities in q -deformed two-mode Fock space are derived by virtue of the q -binomial theorem. As an application of these identities, we prove a new completeness relation for the q -analogue of the single-complex-variable-state in the two-mode Fock space.
The q-deformed entangled states are introduced by using deformation quantization methods and new normal ordering of the vacuum projection operator for q-deformed boson oscillator. In similar way, by virtue of the technique of integration within an ordered product (IWOP) of operators, the new completeness and orthogonality relations composed of the bra and ket, which are not mutually Hermitian conjugates are obtained. Furthermore, the property of squeezing operator represented by the q-deformed entangled states is exhibited. Lastly, the nonclassical properties of the q-deformed two-mode squeezed vacuum state are studied.