Testing the photon-number statistics of a quantum key distribution light source

被引：13

作者：

Dynes, J. F. ^{[1
]}

Lucamarini, M. ^{[1
]}

Patel, K. A. ^{[1
]}

Sharpe, A. W. ^{[1
]}

Ward, M. B. ^{[1
]}

Yuan, Z. L. ^{[1
]}

Shields, A. J. ^{[1
]}

机构：

[1] Toshiba Res Europe Ltd, 208 Cambridge Sci Pk, Cambridge CB4 0GZ, England

来源：

OPTICS EXPRESS | 2018年 / 26卷 / 18期

关键词：

UNCONDITIONAL SECURITY; GENERATION; LASER; FIELD;

D O I：

10.1364/OE.26.022733

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

commonly held tenet is that lasers well above threshold emit photons in a coherent state, which follow Poissonian statistics when measured in photon number. This feature is often exploited to build quantum-based random number generators or to derive the secure key rate of quantum key distribution systems. Hence the photon number distribution of the light source can directly impact the randomness and the security distilled from such devices. Here, we propose a method based on measuring correlation functions to experimentally characterize a light source's photon statistics and use it in the estimation of a quantum key distribution system's key rate. This promises to be a useful tool for the certification of quantum-related technologies. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：22733 / 22749

页数：17

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