量子缠绕量的决定因素-凯发k8官网

量子缠绕量的决定因素
文章来源:未知 文章作者:enread 发布时间:2013-09-16 06:54 字体: [ ] 
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two researchers at ucl computer science and the university of gdansk present a new method for determining the amount of 1 -- a quantum phenomenon connecting two remote partners, and crucial for quantum technology -- within part of a one-dimensional quantum system. in their paper, published this week in nature physics, dr fernando brandão (ucl computer science) and dr michał horodecki (institute for theoretical physics and astrophysics, university of gdansk) demonstrate when the 2 between particles in a sample reduces exponentially with distance, the entanglement between one region and the rest of the sample only depends on the area of the boundary between them.

 

characterising 3 states is essential for technologies such as quantum computation, quantum communication and quantum cryptography(密码学). entanglement is also the difficulty behind making computer simulations of quantum systems. this finding shows that a large class of quantum systems (those with exponential decay of 4) has only limited entanglement and so can be simulated easily.

 

the relationship between area and entanglement was suspected by researchers in this field based on the intuitive argument that if the correlation between particles in a system dropped off rapidly with distance, only nearby particles would be entangled with each other. therefore, particles far away from a boundary would not participate in entanglement and only the boundary area would be relevant.

 

however, this 5 idea was undermined by the existence of a counterexample. this seemed to show that even when two regions could be separated by a layer wide enough to cut off nearly all correlation between them, observers would not be able to know as much about each region as they would if they were genuinely 6. this 'data hiding' phenomenon is a key characteristic of entangled states, where a lack of knowledge of one partner affects what can be measured of the other.

 

this work resolves the apparent difficulty by combining recent findings from quantum information theory, originally developed for 7 quantum communication 8, showing that data hiding cannot hold once exponential decaying correlations are found in all different regions of the system.

 

dr brandão says: "we're very excited to have produced this method. it proves something that seemed to be intuitively true, but the reason why it is true has turned out to be quite different from the original intuition. the result also helps us identify cases where there is low entanglement. these are often good candidates for simulation using classical computers not capable of modeling the consequences of quantum 9."

 

dr horodecki says: "what i especially like about our result, is that, perhaps for the first time in this 10, we used 11 information-theoretic techniques without assuming any specific physical properties of the system other than exponential decaying correlations. this makes the result very general."



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1 hoext     
n.纠缠,牵累
参考例句:
  • this entanglement made carrie anxious for a change of some sort.这种纠葛弄得嘉莉急于改变一下。
  • there is some uncertainty about this entanglement with the city treasurer which you say exists.对于你所说的与市财政局长之间的纠葛,大家有些疑惑。
2 rogzg     
n.相互关系,相关,关连
参考例句:
  • the second group of measurements had a high correlation with the first.第二组测量数据与第一组高度相关。
  • a high correlation exists in america between education and economic position.教育和经济地位在美国有极密切的关系。
3 e3d30c3c857155b7a602a9ac53ade890     
adj.卷入的;陷入的;被缠住的;缠在一起的v.使某人(某物/自己)缠绕,纠缠于(某物中),使某人(自己)陷入(困难或复杂的环境中)( entangle的过去式和过去分词 )
参考例句:
  • the bird had become entangled in the wire netting. 那只小鸟被铁丝网缠住了。
  • some military observers fear the us could get entangled in another war. 一些军事观察家担心美国会卷入另一场战争。 来自《简明英汉词典》
4 4a9b6fe1ddc2671881c9aa3d6cc07e8e     
相互的关系( correlation的名词复数 )
参考例句:
  • one would expect strong and positive correlations between both complexes. 人们往往以为这两个综合体之间有紧密的正相关。
  • the correlations are of unequal value. 这些对应联系的价值并不相同。
5 wgazd4     
a.诱人的, 吸引人的
参考例句:
  • it is tempting to idealize the past. 人都爱把过去的日子说得那么美好。
  • it was a tempting offer. 这是个诱人的提议。
6 bqmztd     
adj.与世隔绝的
参考例句:
  • his bad behaviour was just an isolated incident. 他的不良行为只是个别事件。
  • patients with the disease should be isolated. 这种病的患者应予以隔离。
7 be408cc8d92ec310bb6260bc127c162b     
v.分析;分析( analyze的现在分词 );分解;解释;对…进行心理分析n.分析
参考例句:
  • analyzing the date of some socialist countries presents even greater problem s. 分析某些社会主义国家的统计数据,暴露出的问题甚至更大。 来自辞典例句
  • he undoubtedly was not far off the mark in analyzing its predictions. 当然,他对其预测所作的分析倒也八九不离十。 来自辞典例句
8 66203c461b36a2af573149f0aa6164ff     
n.礼仪( protocol的名词复数 );(外交条约的)草案;(数据传递的)协议;科学实验报告(或计划)
参考例句:
  • there are also protocols on the testing of nuclear weapons. 也有关于核武器试验的协议。 来自辞典例句
  • hardware components and software design of network transport protocols are separately introduced. 介绍系统硬件组成及网络传输协议的软件设计。 来自互联网
9 8n9xp     
n.现象
参考例句:
  • ade couldn't relate the phenomena with any theory he knew.艾德无法用他所知道的任何理论来解释这种现象。
  • the object of these experiments was to find the connection,if any,between the two phenomena.这些实验的目的就是探索这两种现象之间的联系,如果存在着任何联系的话。
10 ys8xc     
n.(活动等)领域,范围;领地,势力范围
参考例句:
  • this information should be in the public domain.这一消息应该为公众所知。
  • this question comes into the domain of philosophy.这一问题属于哲学范畴。
11 fwgwe     
adv.仅仅,唯一地
参考例句:
  • success should not be measured solely by educational achievement.成功与否不应只用学业成绩来衡量。
  • the town depends almost solely on the tourist trade.这座城市几乎完全靠旅游业维持。
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