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arXiv 2202.08356quant-ph
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关于不可扩积基构造真纠缠子空间的一个否定结果

Negative result about the construction of genuinely entangled subspaces from unextendible product bases

Maciej Demianowicz

摘要:

不可扩展的产品基础(UPB)提供了一个通用的工具,在不同领域的量子信息理论的各种应用。因此,全面确定其特征非常重要,二十多年来一直是一个至关重要的问题。一个悬而未决的问题是关于UPB的存在,它们确实是不可扩展的,即,它们甚至对于双积向量也是不可扩展的。换句话说,问题是验证是否存在真正的纠缠子空间(GES),子空间完全由真正的多方纠缠态组成,与UPB互补。我们解决了这个问题的负面的许多大小的UPB在不同的多方方案。特别是,在所有重要的情况下,平等的地方尺寸,我们表明,总是有禁止的基数,这样的UPB,包括最小的GES的最大尺寸。

英文摘要:

Unextendible product bases (UPBs) provide a versatile tool with various applications across different areas of quantum information theory. Their comprehensive characterization is thus of great importance and has been a subject of vital interest for over two decades now. An open question asks about the existence of UPBs, which are genuinely unextendible, i.e., they are not extendible even with biproduct vectors. In other words, the problem is to verify whether there exist genuinely entangled subspaces (GESs), subspaces composed solely of genuinely multiparty entangled states, complementary to UPBs. We solve this problem in the negative for many sizes of UPBs in different multipartite scenarios. In particular, in the all-important case of equal local dimensions, we show that there are always forbidden cardinalities for such UPBs, including the minimal ones corresponding to GESs of the maximal dimensions.

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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