3 papers
quant-ph2011
Fidelity of states in infinite dimensional quantum systems
Jinchuan Hou, Xiaofei Qi
In this paper we discuss the fidelity of states in infinite dimensional systems, give an elementary proof of the infinite dimensional version of Uhlmann's theorem, and then, apply…
math.RA2010
Characterization of Generalized Jordan Higher Derivations on Triangular rings
Xiaofei Qi
Let and be unital rings and be a -bimodule, which is faithful as a left -module and also as a right $\m…
quant-ph2010
Detecting entanglement of states by entries of their density matrices
Xiaofei Qi, Jinchuan Hou
For any bipartite systems, a universal entanglement witness of rank-4 for pure states is obtained and a class of finite rank entanglement witnesses is constructed. In addition, a m…