中国物理B ›› 2010, Vol. 19 ›› Issue (4): 40308-040308.doi: 10.1088/1674-1056/19/4/040308
陈小余
Chen Xiao-Yu(陈小余)†
摘要: In quantum information theory, von Neumann entropy plays an important role; it is related to quantum channel capacities. Only for a few states can one obtain their entropies. In a continuous variable system, numeric evaluation of entropy is not easy due to infinite dimensions. We develop the perturbation theory for systematically calculating von Neumann entropy of a non-degenerate system as well as a degenerate system.
中图分类号: (Algebraic methods)