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Uncertainties induced by statistical fluctuations in fast monoenergetic neutron yield measurements

Chinese Physics C 2014年第10期38卷 44-47页

作者：刘中杰唐琦詹夏宇陈家斌宋仔峰 Laser Fusion Research Center China Academy of Engineering Physics

A plastic scintillation detector was used to measure the yield of deuterium-deuterium （DD） neutrons or deuterium-tritium （DT） neutrons. Collisions of fast neutrons with hydrogen nucleus in a scintillator generated recoil protons, the energies of which were fully deposited in the scintillator. The statistical fluctuation of the protons＇ number and that of the protons＇ total energy were two sources of measurement uncertainty. Based on DT neutrons, this paper represents the algorithms of computing the probability density functions of the two sources. Uncertainties of the measurement induced by statistical fluctuations were finally computed by constructing the probability density functions of the proton number and that of the neutron number.

关键词： probability density function statistic fluctuation uncertainty

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A practical two-way system of quantum key distribution with untrusted source

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Chinese Physics B 2011年第10期20卷 40-45页

作者：陈明娟刘翔 Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education and Department of Physics Hunan Normal University

The most severe problem of a two-way ＂plug-and-play＂（p ＆： p） quantum key distribution system is that the source can be controlled by the eavesdropper. This kind of source is defined as an ＂untrusted source＂. This paper discusses the effects of the fluctuation of internal transmittance on the final key generation rate and the transmission distance. The security of the standard BB84 protocol, one-decoy state protocol, and weak＋vacuum decoy state protocol, with untrusted sources and the fluctuation of internal transmittance are studied. It is shown that the one-decoy state is sensitive to the statistical fluctuation but weak＋vacuum decoy state is only slightly affected by the fluctuation. It is also shown that both the maximum secure transmission distance and final key generation rate are reduced when Alice＇s laboratory transmittance fluctuation is considered.

关键词： statistic fluctuation untrusted source quantum key distribution

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