The unitary and mechanic traditional pedagogy examination in the past, which emphasized the result and overlooked the process , failed to reach the goal.
The adoption of the unitary transform method can transform different frequency filters into the standard lower pass filters, and thus simplify the design process.
采用归一化变换的方法，使不同选频滤波器变换为标准低通滤波器，简化了设计过程。
3
We construct a probabilistic quantum cloning machine by a unitary-reduction process and show that all the linearly independent quantum states can be cloned by this machine in a probabilistic fashion.