量子信息优于经典信息的关键所在是量子态具有相干迭加性。

Coherent superposition is the main superiority of quantum information corresponding to classical information.

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但脆弱的迭加性使得量子信息过程很难在实际的物理系统中得到实现。

However, quantum superposition is quite fragile so that quantum information processes are hard to be implemented in the practical systems.

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多段法渗碳的数学模型是线性偏微分方程。线性偏微分方程的一个重要性质是可迭加性。

The mathematical model of multi stage carburizing is a linear partial differential equation, and superposability is an important property of the linear partial differential equation.

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