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arXiv 0810.0276quant-ph
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非私有信道能传输量子信息吗?

Can non-private channels transmit quantum information?

Graeme Smith, John Smolin

摘要:

我们研究了量子信道的功率与私人通信的能力很小或没有。因为隐私是量子通信的必要条件,人们可能会认为这种信道对传输量子态没有什么用处。尽管如此,我们发现了强有力的证据,证明存在这样的通道对,当它们一起使用时,可以传输比它们各自私人容量之和多得多的量子信息。由于量子传输必然是私有的,这将意味着对私有容量的可加性的严重违反。具体地说,我们提出的通道,显示(1)一个大的联合量子容量,但非常小的个人私人容量或(2)严重违反加性的Holevo信息。

英文摘要:

We study the power of quantum channels with little or no capacity for private communication. Because privacy is a necessary condition for quantum communication, one might expect that such channels would be of little use for transmitting quantum states. Nevertheless, we find strong evidence that there are pairs of such channels that, when used together, can transmit far more quantum information than the sum of their individual private capacities. Because quantum transmissions are necessarily private, this would imply a large violation of additivity for the private capacity. Specifically, we present channels which display either (1) A large joint quantum capacity but very small individual private capacities or (2) a severe violation of additivity for the Holevo information.

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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