We discuss the coherence-assisted transformation of pure coherent states under incoherent operations and show that the amount of coherence loss can be reduced with the help of the auxiliary coherent state. Starting with the simplest case i.e., the main coherent state and auxiliary coherent state are both $2\times 2$ dimensional, we compare the change of coherence before and after the transformation and find that the amount of coherence loss can be reduced due to the increase of the coherence of auxiliary coherent state. In general, when the main coherent state and auxiliary coherent state are high-dimensional, the result is also true. For the coherence of auxiliary coherent state is increased, we can get the maximally coherent state at some conditions, this case can be viewed as a new way for the distillation of coherent state. These interesting results of coherence transformation will give us a better understanding of the resource manipulation.

我们讨论了在非相干运算下纯相干态的相干辅助变换，并表明借助辅助相干态可以减少相干损耗。从最简单的情况开始，即主相干态和辅助相干态都$2\times 2$在维度上，我们比较了变换前后相干性的变化，发现由于辅助相干态相干性的增加，相干损耗的量可以减少。通常，当主相干态和辅助相干态是高维时，结果也是正确的。随着辅助相干态相干性的提高，在一定条件下可以得到最大相干态，这种情况可以看作是一种新的相干态蒸馏方法。这些有趣的一致性转换结果将使我们对资源操纵有了更好的理解。