%0 Journal Article
%T Adaptive continuous variable quantum key distribution based on channel estimation<br>基于信道估计的自适应连续变量量子密钥分发方法
%A Zhu Chang-Hua
%A Pei Chang-Xing
%A Quan Dong-Xiao
%A Chen Nan
%A Yi Yun-Hui
%A <br>朱畅华
%A 裴昌幸
%A 权东晓
%A 陈南
%A 易运晖
%J 物理学报
%D 2009
%I 
%X In order to obtain steady key rate for a continuous variable quantum key distribution system, Alice should adaptively adjust the intensity of optical pulses she sents. In this paper, an optical fiber channel is taken as the additive bosonic quantum Gaussian channel. It is proven that a Gaussian channel transforms Gaussian states into Gaussian states. The maximum-likelihood method is used to estimate the channel parameters after balanced homodyne detection. Then, Alice can change the intensity of optical pulses adaptively according to the estimated noise level, thereby a steady key rate can be obtained.
%K 量子密钥分发，
%K 连续变量，
%K 玻色量子高斯信道，
%K 信道估计
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=1F2EB37A066F5532D37E01E8AB1BD40E&yid=DE12191FBD62783C&vid=9FFCC7AF50CAEBF7&iid=E158A972A605785F&sid=2388B0C36A6A2DBD&eid=0E097192A97BABD4&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=0