1Division of Physics, China Institute of Metrology, Hangzhou 310034
2Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027
Quantum Binary Symmetric Channels
CHEN Xiao-Yu1;QIU Pei-Liang2
1Division of Physics, China Institute of Metrology, Hangzhou 310034
2Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027
Abstract： Quantum binary symmetric channels are defined via the invariance of fidelity under unitary transformations of the input density operators. In this definition, they not only include the most studied case of the depolarizing channel but also other channels. We investigate the character of the latter and find the maximum of the coherent information to estimate the capacities of the channels.
2001, Vol. 18 
