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arXiv quant-ph/0506203quant-ph
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具有单向可验证密钥的低维束缚纠缠

Low dimensional bound entanglement with one-way distillable cryptographic key

Karol Horodecki, Lukasz Pankowski, Michal Horodecki, Pawel Horodecki

摘要:

我们给出了一类具有正量子密钥速率的束缚纠缠态。这类纠缠态的最小态是$4 \otimes 4$,这表明束缚纠缠态所包含的特殊安全性并不需要高维系统。我们表明,对于这些状态,可以通过{ \it one-way} Devetak-Winter协议获得正的密钥速率。随后证明了任意维的束缚纠缠密钥可交换态的体积是非零的。本文提出了一种基于局域观测量的实验预备态密码学性质的验证方案。建议的7个集体设置被证明是最佳的设置数量。

英文摘要:

We provide a class of bound entangled states that have positive distillable secure key rate. The smallest state of this kind is $4 \otimes 4$, which shows that peculiar security contained in bound entangled states does not need high dimensional systems. We show, that for these states a positive key rate can be obtained by {\it one-way} Devetak-Winter protocol. Subsequently the volume of bound entangled key-distillable states in arbitrary dimension is shown to be nonzero. We provide a scheme of verification of cryptographic quality of experimentally prepared state in terms of local observables. Proposed set of 7 collective settings is proven to be optimal in number of settings.

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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