Graph states and local unitary transformations beyond local Clifford operations
Graph states and local unitary transformations beyond local Clifford operations
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DOI：
10.1088/1751-8121/aa67cd
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发表时间：
2016-11
期刊：
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通讯作者：
Nikoloz Tsimakuridze;O. Gühne
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作者：
Nikoloz Tsimakuridze;O. Gühne
图态是可以用稳定子形式描述的量子态，在量子信息处理中起着重要的作用。我们考虑了局部酉运算对图状态和超图状态的作用。我们专注于非Clifford操作，并找到某些变换的图形描述的加权超图。这导致了超图状态的识别，这些超图状态是局部等价于图状态的。此外，我们提出了一个系统的方法来构造图的状态对，这是等价的局部酉操作，但不等价的局部Clifford操作。这产生了一个被称为LU-LC猜想的猜想的反例。到目前为止，这个猜想的唯一反例是通过随机搜索找到的。我们的方法再现了已知的最小的反例作为一种特殊情况，并提供了一个物理解释。
Graph states are quantum states that can be described by a stabilizer formalism and play an important role in quantum information processing. We consider the action of local unitary operations on graph states and hypergraph states. We focus on non-Clifford operations and find for certain transformations a graphical description in terms of weighted hypergraphs. This leads to the indentification of hypergraph states that are locally equivalent to graph states. Moreover, we present a systematic way to construct pairs of graph states which are equivalent under local unitary operations, but not equivalent under local Clifford operations. This generates counterexamples to a conjecture known as LU-LC conjecture. So far, the only counterexamples to this conjecture were found by random search. Our method reproduces the smallest known counterexample as a special case and provides a physical interpretation.