Improved quantum de Finetti theorem and its application in quantum key distribution

Improved quantum de Finetti theorem and its application in quantum key distribution
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改进的量子de Finetti定理及其在量子密钥分配中的应用

DOI:
10.1103/physreva.101.042310
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发表时间:
2020-04
期刊:
影响因子:
2.9
通讯作者:
Hong-Yi Su
Hong-Yi Su
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hong-Yi Su

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量子德·菲内蒂定理表明,在大系统的排列不变特性和描述其子系统的独立的、相同的分布之间存在着令人惊讶的联系。这个定理非常重要,因为它允许人们在有限的误差范围内,仅从对称性推断独立性,这两个概念在物理和数学中都是重要的和基本的概念。在这里,我们提出了一个改进的量子de Finetti定理,它提供了一个更低的误差界,从而在对称性和独立性之间建立了比以前更紧密的关系。作为应用,我们研究了量子密钥分配在最一般攻击下的安全性,并证明了其密钥率高于已有的基于迹范数的De Finetti定理。因此,本文提出了量子de Finetti定理在量子信息处理中的应用,以及该定理本身的发展。
Quantum de Finetti theorem indicates that a surprising connection exists between the permutation-invariant property of a large system and the independent, identical distribution that describes its subsystems. The theorem is highly nontrivial in that it allows one to infer independence---within a finite error---from symmetry alone, both of which are important and fundamental concepts in physics and mathematics. Here, we present an improved quantum de Finetti theorem that provides a lower error bound, thus establishing an even closer relationship between symmetry and independence than before. As application, we study the security of quantum key distribution under the most general attacks, and show that the key rate is higher than previous ones obtained by existing trace-norm-based de Finetti theorems. Therefore, the application of the quantum de Finetti theorem in quantum information processing, as well as developing the theorem itself, is advanced here.
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发表时间: 2013-03
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