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arXiv quant-ph/9912010quant-ph
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2xN复合量子系统的可分性

Separability in 2xN composite quantum systems

B. Kraus, J. I. Cirac, S. Karnas, M. Lewenstein

摘要:

分析了部分转置为正算子的$\C^2\otimes \C^N$上密度算子的可分性。我们证明了如果$ρ$的秩等于N,则它是可分的,并且束缚纠缠态的秩大于N。我们还给出了一般密度算子的可分性准则,使得它的秩与它的部分转置的秩之和不超过3N。如果它超过这个数字,我们表明,可以减去产品矢量,直到减少到3N,同时保持积极的$ρ$和它的部分转置。这自动地给了我们一般密度算子可分性的充分判据。我们还证明了所有的密度算子,保持不变的部分转置后相对于第一个系统是可分的。

英文摘要:

We analyze the separability properties of density operators supported on $\C^2\otimes \C^N$ whose partial transposes are positive operators. We show that if the rank of $ρ$ equals N then it is separable, and that bound entangled states have rank larger than N. We also give a separability criterion for a generic density operator such that the sum of its rank and the one of its partial transpose does not exceed 3N. If it exceeds this number we show that one can subtract product vectors until decreasing it to 3N, while keeping the positivity of $ρ$ and its partial transpose. This automatically gives us a sufficient criterion for separability for general density operators. We also prove that all density operators that remain invariant after partial transposition with respect to the first system are separable.

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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