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composed of the common eigenvectors of operators (x1 +p2) and (p1 + x2) is established. Eigenvalues and eigenvectors resentation. We find that the second-quantization representation can be used to derive the normally ordered product expression of eigenvector in Fock space. In particular, we find that the ground state of the Hamiltonian is a kind of generalized two-mode squeezed state.