arXivDaily arXiv每日学术速递 周一至周五更新
arXiv quant-ph/0505118quant-ph
收藏

连续变量私有量子信道

Continuous variable private quantum channel

Kamil Bradler

摘要:

本文在连续变量框架下引入了量子私有信道的概念,并研究了它的性质。在CVPQC方面,我们自然地定义了一个“最大”的混合状态在相空间中,连同其明确的建设,并表明,对于越来越多的加密操作(设置的长度之间的共享密钥的Alice和Bob)的加密状态是任意接近的希尔伯特-施密特距离的意义上的最大混合状态。我们带来了精确的解决方案的距离依赖性,并给出了一个粗略的估计所需的共享密钥的位数(即有多少经典的资源需要近似加密的一个一般未知的连续变量状态)。CVPQC的定义进行了分析,从Holevo界的角度来看,它确定了一个上限的信息传入的状态窃听者能够从他的最佳测量。

英文摘要:

In this paper we introduce the concept of quantum private channel within the continuous variables framework (CVPQC) and investigate its properties. In terms of CVPQC we naturally define a "maximally" mixed state in phase space together with its explicit construction and show that for increasing number of encryption operations (which sets the length of a shared key between Alice and Bob) the encrypted state is arbitrarily close to the maximally mixed state in the sense of the Hilbert-Schmidt distance. We bring the exact solution for the distance dependence and give also a rough estimate of the necessary number of bits of the shared secret key (i.e. how much classical resources are needed for an approximate encryption of a generally unknown continuous-variable state). The definition of the CVPQC is analyzed from the Holevo bound point of view which determines an upper bound of information about an incoming state an eavesdropper is able to get from his optimal measurement.

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。

↑