The interaction of a pair of two-level atoms initially in the entangled state with the coherent field is studied. Influence of entangled state of atomic dipole-dipole interaction on the fidelity of quantum states is surveyed.
The quantum information Fidelity of two entangled-atoms interacting with coherent state light-field is studied by means of quantum theory.The results show that quantum information fidelity of system,atoms and light field will drastically decrease as the intensity of field increases.The fidelity of system and field will increase and vary simultaneously with the increasing of atoms' dipole-dipole interaction,but the fidelity of atoms will increase obviously. The atoms' entanglement has a little influence on the fidelity of system,atom and light field.
We have investigated the influence of dipole-dipole interaction and initial atomic coherence on atomic entanglement dynamics of two qubits. We have considered a model, in which only one atom couples to a quantum electromagnetic field in a cavity, since one of them can move around the cavity. We have shown that the entanglement arises for all pure atomic state even when both atoms are initially in the excited states. We have also derived that degree of entanglement is enhanced in the presence of the atomic coherence.
We have investigated the influence of dipole-dipole interaction and initial atomic coherence on atomic entanglement dynamics of two qubits. We have considered a model, in which only one atom couples to a quantum electromagnetic field in a cavity, since one of them can move around the cavity. We have shown that the entanglement arises for all pure atomic state even when both atoms are initially in the excited states. We have also derived that degree of entanglement is enhanced in the presence of the atomic coherence.
The fidelities of quantum information of two identical two-level atoms of entanglement state Raman interacting with the squeezed vacuum field are studied by means of the fully quantum theory and numerical calculations.The results shows the fidelity of system,atoms and field will drastically decrease as the squeezing parameter of the initial light increases,and that the fidelity is correlated with the degree of entanglement of the initial two identical two-level atoms and the intensity of dipole-dipole interaction between atoms.