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arXiv quant-ph/0312110quant-ph
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催化剂辅助纠缠变换与多拷贝变换的关系

Relation Between Catalyst-assisted Entanglement Transformation and Multiple-copy Transformation

Yuan Feng, Runyao Duan, Mingsheng Ying

摘要:

我们证明了在某些情况下,催化剂辅助的纠缠变换不能通过纯态的多拷贝变换来实现。这一事实与我们在[R. Y. Duan,Y. Feng,X. Li,和M。S. Ying,Phys.Rev.A71,042319(2005)],后者可以完全由前者实施,表明催化剂辅助转化严格地比多拷贝转化更强大。然而,对于纯概率的情形,我们发现这两种变换在几何上是等价的,即无论使用催化剂辅助变换还是多拷贝变换,能以不小于给定值的最大概率转换成给定纯态的纯态集合都具有相同的闭包。

英文摘要:

We show that in some cases, catalyst-assisted entanglement transformation cannot be implemented by multiple-copy transformation for pure states. This fact, together with the result we obtained in [R. Y. Duan, Y. Feng, X. Li, and M. S. Ying, Phys. Rev. A 71, 042319 (2005)] that the latter can be completely implemented by the former, indicates that catalyst-assisted transformation is strictly more powerful than multiple-copy transformation. For purely probabilistic setting we find, however, these two kinds of transformations are geometrically equivalent in the sense that the sets of pure states which can be converted into a given pure state with maximal probabilities not less than a given value have the same closure, no matter catalyst-assisted transformation or multiple-copy transformation is used.

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