| The combination of quantum physics and information science yields a new interdiscipline, namely, quantum informatics. Quantum informatics mainly includes preparation of quantum state, quantum teleportation, quantum communication, light-quanta communication, quantum coding and quantum dense coding, quantum encryption and decryption, quantum algorithms and quantum computation and so forth.In this thesis, the complete quantum theory is utilized to study the properties of the evolution and squeezing of quantum field-entropy, and the properties of the evolution and squeezing of atomic information-entropy, and therefore a series of new results and conclusions are obtained. The main results are as follows:1. The time evolution properties of the quantum field-entropy of light-field in the system of binomial state light-field interacting with two identical dipole-dipole coupled two-level atoms are studied, and its general characteristic is also revealed.2. The squeezing properties of the quantum field-entropy of light-field in the system of two-mode squeezed vacuum state light-field interacting with the two identical dipole-dipole coupled two-level atoms are studied, and its nonclassical physical essence is therefore exposured.3. The time evolution properties of the atomic information entropy of two identical two-level atoms interacting with a single-mode coherent state light-field are studied, and its time evolution characteristic is further analyzed.4. The squeezing properties of the atomic information entropy in the system of the two identical dipole-dipole coupled two-level atoms interacting with a single-mode coherent state light-field are studied, and its nonclassical physical essence is also revealed furtherly.The researches mentioned above are of the important applications for the field of light-quantum communication, and are of the theoretical guidance for the further experimental researches related to this thesis closely.
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