用于经典信息传输的广播量子信道
The broadcast quantum channel for classical information transmission
摘要：
众所周知，量子理论禁止精确复制未知的量子态。因此，在通过量子信道广播经典信息时，预期对解码中的误差的额外贡献。我们考虑了两个线性无关的量子态的经典信息传输的最佳复制变换，并证明了对误差没有附加贡献。相反，克隆是相关的，这打破了它们的有用性：纠缠随着状态的非正交性而增加。还考虑了相应的量子信道的容量。
英文摘要：
It is well known that quantum theory forbids the exact copying of an unknown quantum state. Therefore in broadcasting of classical information by a quantum channel an additional contribution to the error in the decoding is expected. We consider the optimal copying transformation which is adapted to classical information transmission by two linearly independent quantum states, and show that there is no additional contribution to the error. Instead the clones are correlated, and this breaks their usefulness: The entanglement increases with non-orthogonality of the states. The capacity of the corresponding quantum channel is considered also.
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