The two-level atom is described by Pauli sign and environment is described by infinite harmonic particle thermal reservoir.A pair of two-level atoms' reducible density rectangular array is obtained when the Raman interaction of atoms with a thermal radiation field atoms by dipole-dipole interaction is put in a thermal reservoir.The paper has studied the fidelity of two-level atoms which are put in the strongly thermal radiation field.The properties of fidelity are discussed.It is shown that the two two-level atoms initially situated in different coherent superposition states,quantum information fidelities have obvious differences.
The quantum properties of the light field in the system of thermal radiation field interacting with two identical entangled atoms are studied by means of time evolution operator and numerical calculations.The results show that the entanglement degree of the initial two identical two-level entangled atoms and the intensity of the thermal radiation field have influence on the quantum properties of light field.For the initial light field with appropriate intensity,the non-classical properties of the light field will appear.The non-classical properties are increased by the growth of the intensity of the initial thermal radiation field,but the influence of the entanglement degree on the non-classical properties is complex.