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arXiv quant-ph/0504208quant-ph
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多体稳定态的GHZ提取率

GHZ extraction yield for multipartite stabilizer states

Sergey Bravyi, David Fattal, Daniel Gottesman

摘要:

假设$|Ψ>$是分布在三个远程方之间的任意稳定器状态,使得每一方持有几个量子位。令$S$是$|Ψ>$的稳定子群。我们表明,$|Ψ>$可以被本地幺正转换成一个集合的单态,GHZ状态,和本地单量子比特状态。单态和GHZ的数目由$S$的某些子群的维数决定。对于任意数目的$m$,我们找到了一个公式的最大数目的$m$ -particular GHZ态,可以提取$|Ψ>$的本地酉。与早先介绍的措施的多方相关性的连接。给出了一个不可分解的四方稳定态的例子。这些结果是来自一个一般的理论框架,允许一个研究相互转换的多体稳定状态的本地Clifford群运营商。作为一个简单的应用,我们研究了二维晶格模型中的三方纠缠,可以精确地解决稳定剂形式主义。

英文摘要:

Let $|Ψ>$ be an arbitrary stabilizer state distributed between three remote parties, such that each party holds several qubits. Let $S$ be a stabilizer group of $|Ψ>$. We show that $|Ψ>$ can be converted by local unitaries into a collection of singlets, GHZ states, and local one-qubit states. The numbers of singlets and GHZs are determined by dimensions of certain subgroups of $S$. For an arbitrary number of parties $m$ we find a formula for the maximal number of $m$-partite GHZ states that can be extracted from $|Ψ>$ by local unitaries. A connection with earlier introduced measures of multipartite correlations is made. An example of an undecomposable four-party stabilizer state with more than one qubit per party is given. These results are derived from a general theoretical framework that allows one to study interconversion of multipartite stabilizer states by local Clifford group operators. As a simple application, we study three-party entanglement in two-dimensional lattice models that can be exactly solved by the stabilizer formalism.

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