Quantifying the coherence of pure quantum states

Quantifying the coherence of pure quantum states
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量化纯量子态的相干性

DOI:
10.1103/physreva.94.042313
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发表时间:
2016-01
期刊:
影响因子:
2.9
通讯作者:
Sarah Plosker
Sarah Plosker
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Jianxin Chen;Shane Grogan;Nathaniel Johnston;Chi-Kwong Li;Sarah Plosker

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近年来,人们提出了几种方法来表征给定量子态的相干性。我们得到了几个结果,说明这些措施如何表现时,仅限于纯状态。值得注意的是,我们在相干的迹距度量下给出了与给定纯态最接近的非相干态的显式表征。然后我们用这个结果证明了相干迹距最大化的状态正是最大相干态。我们定义了纠缠的痕迹距离,并证明了它与纯态相干的痕迹距离是一致的。最后,我们对最近的一个结果给出了一个替代证明,即纯态的相干测度永远不会小于它的相干相对熵。
In recent years, several measures have been proposed for characterizing the coherence of a given quantum state. We derive several results that illuminate how these measures behave when restricted to pure states. Notably, we present an explicit characterization of the closest incoherent state to a given pure state under the trace distance measure of coherence. We then use this result to show that the states maximizing the trace distance of coherence are exactly the maximally coherent states. We define the trace distance of entanglement and show that it coincides with the trace distance of coherence for pure states. Finally, we give an alternate proof to a recent result that the $\ell_1$ measure of coherence of a pure state is never smaller than its relative entropy of coherence.
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