A model is built when the two two-level atoms is in thermal radiation field environment. By means of the density rectangular method, two two-level atoms reducible density rectangular array is obtained when atoms by dipole-dipole interaction are put in a thermal reservoir. The problem of fidelity of two-level atoms is studied which are put in the strongly thermal radiation field. It is shown that the two two-level atoms initially situated in different coherent superposition states, quantum information may lose fidelities partly or may not lose fidelities during evolution in transmit process. Th...
