Purification of noisy entanglement and faithful teleportation via noisy channels
Purification of noisy entanglement and faithful teleportation via noisy channels
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DOI：
10.1103/physrevlett.76.722
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发表时间：
1996-01-29
影响因子：
8.6
通讯作者：
Wootters, WK
中科院分区：
文献类型：
--
作者：
Bennett, CH;Brassard, G;Wootters, WK
通过将局部操作应用于不太纯净的纠缠态(例如，通过噪声信道共享的单态)的供应，两个分离的观察者可以制备数量较少的任意高纯度的纠缠对(例如，近乎完美的单态)。然后，这些可以用来忠实地将未知量子态从一个观察者传送到另一个观察者，从而通过噪声信道实现量子信息的忠实传输。给出了可从混合态M中蒸馏的纯单重态(Psi(-)]的产率D(M)的上界和下界，证明了D(M)和Gt；0若[Psi(-)\M\Psi(-)]>；1/2.
Two separated observers, by applying local operations to a supply of not-too-impure entangled states (e.g., singlets shared through a noisy channel), can prepare a smaller number of entangled pairs of arbitrarily high purity (e.g., near-perfect singlets). These can then be used to faithfully teleport unknown quantum states from one observer to the other, thereby achieving faithful transmission of quantum information through a noisy channel. We,give upper and lower bounds on the yield D(M) of pure singlets (\Psi(-)]) distillable from mixed states M, showing D(M) > 0 if [Psi(-)\M\Psi(-)] > 1/2.