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arXiv quant-ph/0008046quant-ph
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利用压缩态实现安全的量子密钥分发

Secure quantum key distribution using squeezed states

Daniel Gottesman, John Preskill

摘要:

证明了一种基于谐振子压缩量子态传输的量子密钥分发方案的安全性。我们的证明采用量子纠错码,将有限维量子系统编码在振荡器的无限维希尔伯特空间中,并防止移动正则变量p和q的错误。如果量子信道中的噪声很弱,则将信号状态压缩2.51 dB(压缩因子e^r=1.34)原则上足以确保通过经典纠错和隐私放大适当增强的协议的安全性。安全的密钥分发可以在与量子信道的衰减长度相当的距离上实现。

英文摘要:

We prove the security of a quantum key distribution scheme based on transmission of squeezed quantum states of a harmonic oscillator. Our proof employs quantum error-correcting codes that encode a finite-dimensional quantum system in the infinite-dimensional Hilbert space of an oscillator, and protect against errors that shift the canonical variables p and q. If the noise in the quantum channel is weak, squeezing signal states by 2.51 dB (a squeeze factor e^r=1.34) is sufficient in principle to ensure the security of a protocol that is suitably enhanced by classical error correction and privacy amplification. Secure key distribution can be achieved over distances comparable to the attenuation length of the quantum channel.

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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