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arXiv quant-ph/0403076quant-phcs.CRphysics.optics
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利用偏振相干态的量子密钥分发

Quantum key distribution using polarized coherent states

A. Vidiella-Barranco, L. F. M. Borelli

摘要:

讨论了利用强偏振相干态实现量子密钥分发的连续变量方法。密钥编码使用称为斯托克斯参数的变量而不是场求积来执行。它们的量子对应物,Stokes算符$\hat{S}_i$(i= 1,2,3),构成了一组非对易算符,它们中的一对同时测量的精度受到类似不确定关系的限制。Alice发送一个方便调制的双模相干态,Bob随机测量入射光束的一个斯托克斯参数。在执行协调和隐私放大过程之后,可以提取秘密公共密钥。我们还考虑了一种非理想的情况,在这种情况下,与热噪声的相干态,而不是纯相干态,用于编码。

英文摘要:

We discuss a continuous variables method of quantum key distribution employing strongly polarized coherent states of light. The key encoding is performed using the variables known as Stokes parameters, rather than the field quadratures. Their quantum counterpart, the Stokes operators $\hat{S}_i$ (i=1,2,3), constitute a set of non-commuting operators, being the precision of simultaneous measurements of a pair of them limited by an uncertainty-like relation. Alice transmits a conveniently modulated two-mode coherent state, and Bob randomly measures one of the Stokes parameters of the incoming beam. After performing reconciliation and privacy amplification procedures, it is possible to distill a secret common key. We also consider a non-ideal situation, in which coherent states with thermal noise, instead of pure coherent states, are used for encoding.

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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