arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv quant-ph/0611167quant-phcs.CRcs.ITmath.ITphysics.optics
收藏

基于双向量子通信的连续变量量子密码

Continuous Variable Quantum Cryptography using Two-Way Quantum Communication

Stefano Pirandola, Stefano Mancini, Seth Lloyd, Samuel L. Braunstein

摘要:

量子密码学最近已经扩展到连续变量系统,例如,电磁场的玻色子模式特别是,已经提出了几个密码协议,并使用高斯统计的玻色子模式进行实验。这样的协议已经显示出达到非常高的密钥速率的可能性,即使在量子通信信道中存在严重损失的情况下。尽管这种鲁棒性的损失,他们的安全性可能会受到更一般的攻击,其中额外的高斯噪声是由窃听者。在这个一般场景中,我们展示了一个用于增强这些协议的安全阈值的“硬件解决方案”。这可以通过将它们扩展到双向量子通信来实现,其中量子信道的后续使用被适当地组合。在由此产生的双向方案中,诚实的一方协助另一方的秘密编码,并有机会获得安全阈值的非平凡超加性增强。这些结果使得量子密码学能够扩展到更复杂的量子通信。

英文摘要:

Quantum cryptography has been recently extended to continuous variable systems, e.g., the bosonic modes of the electromagnetic field. In particular, several cryptographic protocols have been proposed and experimentally implemented using bosonic modes with Gaussian statistics. Such protocols have shown the possibility of reaching very high secret-key rates, even in the presence of strong losses in the quantum communication channel. Despite this robustness to loss, their security can be affected by more general attacks where extra Gaussian noise is introduced by the eavesdropper. In this general scenario we show a "hardware solution" for enhancing the security thresholds of these protocols. This is possible by extending them to a two-way quantum communication where subsequent uses of the quantum channel are suitably combined. In the resulting two-way schemes, one of the honest parties assists the secret encoding of the other with the chance of a non-trivial superadditive enhancement of the security thresholds. Such results enable the extension of quantum cryptography to more complex quantum communications.

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。

↑