Quantum discord as a resource for quantum cryptography.

Quantum discord as a resource for quantum cryptography.
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DOI:
10.1038/srep06956
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发表时间:
2014-11-07
期刊:
影响因子:
4.6
通讯作者:
Pirandola S
Pirandola S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Pirandola S

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量子不协调是安全量子密钥分发所需的最小二部资源,是等价于非正交性的密码原语。它的作用在依赖于设备的量子密码学中变得至关重要,在这种情况下,准备和检测噪声(各方都无法获得)的存在可能如此强烈,以至于阻止了纠缠的分布和蒸馏。在与设备无关的量子密码学的更强场景中,纠缠的必要性得到了重申,其中所有噪声源都归因于窃听者。
Quantum discord is the minimal bipartite resource which is needed for a secure quantum key distribution, being a cryptographic primitive equivalent to non-orthogonality. Its role becomes crucial in device-dependent quantum cryptography, where the presence of preparation and detection noise (inaccessible to all parties) may be so strong to prevent the distribution and distillation of entanglement. The necessity of entanglement is re-affirmed in the stronger scenario of device-independent quantum cryptography, where all sources of noise are ascribed to the eavesdropper.
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