By using this method, we can realize the phase-covariant quantum cloning by four steps.
用这种方法，相位协变量子克隆可以通过四步来实现。
The result shows that there exists a class of optimal phase-covariant quantum cloning.
结果表明存在一类最优相位协变量子克隆。
The result shows that there exists a class of optimal phase-covariant quantum cloning.
结果表明存在一类最优相位协变量子克隆。
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