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arXiv quant-ph/0203093quant-ph
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纠缠态相对熵的修正

Modification of relative entropy of entanglement

An Min Wang

摘要:

我们提出了修正的相对熵(MRE),它被证明是可压缩纠缠(DE)的上界,也是纠缠的相对熵(RE)的上界,是形成纠缠(EF)的下界.对于纯态,通过要求MRE等于EF来求MRE。对于混合态,通过定义总相对密度矩阵来计算MRE。对于两个量子比特系统,我们得到了依赖于纯态分解的MRE的显式和“弱”封闭表达式,并给出了计算多个量子比特系统MRE的原则算法。MRE显著地提高了RE的可计算性,降低了EF对纯态分解的敏感性,揭示了类似偏离态与Bell态的特殊差异,恢复了与信息论一致的组分态概率对数依赖性。作为例子,我们计算了Bell态和Bell态的偏离态的混合态的MRE,并与EF和Wootters的EF进行了比较。此外,我们还研究了MRE的重要性质,包括在局域一般测量(LGM)和经典通信(CC)下的行为。

英文摘要:

We present the modified relative entropy of entanglement (MRE) that is proved to be a upper bound of distillable entanglement (DE), also relative entropy of entanglement (RE), and a lower bound of entanglement of formation (EF). For a pure state, MRE is found by the requirement that MRE is equal to EF. For a mixed state, MRE is calculated by defining a total relative density matrix. We obtain an explicit and "weak" closed expressions of MRE that depends on the pure state decompositions for two qubit systems and give out an algorithm to calculate MRE in principle for more qubit systems. MRE significantly improves the computability of RE, decreases the sensitivity on the pure state decompositions in EF, reveals the particular difference of similar departure states from Bell's state and restore the logarithmic dependence on probability of component states consistent with information theory. As examples, we calculate MRE of the mixture of Bell's states and departure states from Bell's states, and compare them with EF as well as Wootters' EF. Moreover we study the important properties of MRE including the behavior under local general measurement (LGM) and classical communication (CC).

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