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arXiv 1003.3059quant-ph
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张量秩与多体纯态的随机纠缠催化

Tensor Rank and Stochastic Entanglement Catalysis for Multipartite Pure States

Lin Chen, Eric Chitambar, Runyao Duan, Zhengfeng Ji, Andreas Winter

摘要:

多体纯态的张量秩(又称广义Schmidt秩)在纠缠分类和纠缠变换的研究中起着重要的作用。我们利用齐次多项式理论中的有力工具来研究对称态的张量秩,如三重态$\ket{W_3}=\tfrac{1}{\sqrt{3}}(\ket{100}+\ket{010}+\ket{001})$及其$N$ -partite推广$\ket{W_N}$ .先前的张量秩估计得到了显著的改进,并且我们表明:(i)$\ket{W_3}$的三个拷贝的秩为15或16,(ii)$\ket{W_N}$的两个拷贝的秩为$3N-2$,以及(iii)$\ket{W_N}$的$n$拷贝的秩为O(N)。这些结果的一个显着的后果是,某些多体转换,甚至不可能的概率,可以成为可能时,在多个副本束或一些催化状态的帮助下进行。这种效应对于二分纯态是不可能的。

英文摘要:

The tensor rank (also known as generalized Schmidt rank) of multipartite pure states plays an important role in the study of entanglement classifications and transformations. We employ powerful tools from the theory of homogeneous polynomials to investigate the tensor rank of symmetric states such as the tripartite state $\ket{W_3}=\tfrac{1}{\sqrt{3}}(\ket{100}+\ket{010}+\ket{001})$ and its $N$-partite generalization $\ket{W_N}$. Previous tensor rank estimates are dramatically improved and we show that (i) three copies of $\ket{W_3}$ has rank either 15 or 16, (ii) two copies of $\ket{W_N}$ has rank $3N-2$, and (iii) $n$ copies of $\ket{W_N}$ has rank O(N). A remarkable consequence of these results is that certain multipartite transformations, impossible even probabilistically, can become possible when performed in multiple copy bunches or when assisted by some catalyzing state. This effect is impossible for bipartite pure states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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