The level surfaces of quantum discord for a class of two-qubit states are investigated when the Bloch vectors T and S are perpendicularly oriented. The geometric objects of tetrahedron T and octahedron 0 are deformed....The level surfaces of quantum discord for a class of two-qubit states are investigated when the Bloch vectors T and S are perpendicularly oriented. The geometric objects of tetrahedron T and octahedron 0 are deformed. The level surfaces of constant discord are formed by three interaction ＂tubes＂ along three orthogonal directions. They shrink to the center when the B1oeh vectors are increased and are expanded and cut off by the state tetrahedron T when the quantum discord is increased, in the phase damping channel, the quantum discord keeps approximately a constant when the time increases.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.11074184,11204197the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No.20103201120002the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘The level surfaces of quantum discord for a class of two-qubit states are investigated when the Bloch vectors T and S are perpendicularly oriented. The geometric objects of tetrahedron T and octahedron 0 are deformed. The level surfaces of constant discord are formed by three interaction ＂tubes＂ along three orthogonal directions. They shrink to the center when the B1oeh vectors are increased and are expanded and cut off by the state tetrahedron T when the quantum discord is increased, in the phase damping channel, the quantum discord keeps approximately a constant when the time increases.
