Algorithmic superactivation of asymptotic quantum capacity of zero-capacity quantum channels

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• 作者：Laszlo Gyongyosi^a ; ^b ; ^{gyongyosi@hit.bme.hu} ; Sandor Imre^a
• 关键词：Quantum capacity ; Superactivation ; Zero-capacity quantum channels
• 刊名：Information Sciences
• 出版年：2013
• 出版时间：10 February, 2013
• 年：2013
• 卷：222
• 期：Complete
• 页码：737-753
• 全文大小：948 K

文摘

The superactivation of zero-capacity quantum channels makes it possible to use two zero-capacity quantum channels with a positive joint capacity for their output. Currently, we have no theoretical background to describe all possible combinations of superactive zero-capacity channels; hence, there may be many other possible combinations. In practice, to discover such superactive zero-capacity channel-pairs, we must analyze an extremely large set of possible quantum states, channel models, and channel probabilities. There is still no extremely efficient algorithmic tool for this purpose. This paper shows an efficient algorithmical method of finding such combinations. Our method can be a very valuable tool for improving the results of fault-tolerant quantum computation and possible communication techniques over very noisy quantum channels.