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arXiv quant-ph/9807041quant-ph
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量子密码六态协议中的非相干和相干发射丢弃

Incoherent and Coherent Eavesdropping in the 6-state Protocol of Quantum Cryptography

H. Bechmann-Pasquinucci, N. Gisin

摘要:

对六态量子密码协议的所有非相干窃听策略以及2-和3-量子比特相干窃听策略进行了分类。对于1/6的扰动,最优非相干窃听策略归结为通用量子克隆机。相干窃听不能增加夏娃的香农信息,无论是在整个比特串上,还是在鲍勃未受干扰地接收到的比特集上。然而,相干窃听可以增加夏娃的Renyi信息以及她正确猜测所有比特的概率。Eve延迟测量她的探针,直到公众讨论纠错和隐私放大的情况下也被考虑。有人认为,通过这样做,夏娃只获得了微不足道的额外信息。

英文摘要:

All incoherent as well as 2- and 3-qubit coherent eavesdropping strategies on the 6 state protocol of quantum cryptography are classified. For a disturbance of 1/6, the optimal incoherent eavesdropping strategy reduces to the universal quantum cloning machine. Coherent eavesdropping cannot increase Eve's Shannon information, neither on the entire string of bits, nor on the set of bits received undisturbed by Bob. However, coherent eavesdropping can increase as well Eve's Renyi information as her probability of guessing correctly all bits. The case that Eve delays the measurement of her probe until after the public discussion on error correction and privacy amplification is also considered. It is argued that by doing so, Eve gains only a negligibly small additional 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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