Quantum Entanglement And Quantum Correlation Of An Arbitrary Two-qubit Atom Interacting With The Optical Field

Many researches on the properties of quantum entanglement were discovered in quantum optics and quantum information.In the sequence of time,the concepts of Von Neumann entropy,concurrence and Negative eigenvalues of partially transposed matrices has been advanced.Thus,people have a further understanding and application of entanglement.Furthermore,the environmental impact on the quantum entanglement is beginning to be paid attention.The interaction system of atomic and optical fields is also affected by phenomenon of entanglement sudden death.The emergence phenomenon of entanglement sudden death hinders the development of quantum information.Until the quantum disassociation is proposed,quantum correlation is known as a new quantum resource.Compared with the quantum discord,the geometric quantum discord's scheme can give an analytic expression of an arbitrary two-qubit quantum state.The complex calculation in the quantum disassociation could be avoided accordingly.In addition,study on quantum entanglement and quantum correlation of an arbitrary two-qubit interaction between the atoms and the optical field that needs to be expanded.The system of quantum entanglement and quantum correlation calculated that an arbitrary two-qubit atoms interacts with Fock state optical field,Coherent state optical field and the Binomial state optical field respectively in this paper.As a solution,concurrence and the geometric quantum discord can be the measurement of quantum entanglement and quantum correlation respectively.In the different initial state of atoms interacting with light field,the evolution of concurrence and the geometric quantum discord can be observed with the time.At the same time,the influence of photon number in the Fock state light field,a in the coherent state light field and Bernoulli probabilitys or maximum photon numberin the binomial state light field on that the evolution of concurrence and the geometric quantum discord with time is also discussed.