Quantum communication in China are wide of the mark once the interference into the device communicate quantum | | | China News
Original title: quantum communications in China are wide of the mark: once the interference into the device
[Global network military news] on August 16, the world's first quantum scientific experimental satellite "Mozi" was successfully launched, China will be the world's first satellite and quantum communication between ground. Disputes surrounding the quantum communication and uninterrupted online then there have been some question in quantum communication. Micro-scale University of science and technology of China in Hefei national laboratory for physical sciences Associate Professor Yuan Lan Feng said in an interview with the newspaper 17th, was questioned in the development and growth of quantum communication, but technical questions cannot prevent development of quantum communications strategic directions.
Quantum properties that cannot be copied, is the fundamental source of quantum communication security. Eavesdroppers want to intercept quantum signal, it is necessary to measure it, and this will break down the key information-carrying quantum state, so they may be found. In theory, such an eavesdropping do not duplicate information transmission can guarantee the absolute security of information transmission, this is only a way to physically secure information security, and based on the computational complexity of the past was much better compared to conventional Cryptography.
But some question, "seemingly unassailable quantum communications, was actually at the expense of stability of information." Because as soon as the enemy of any form of intrusion, whether it is interference or eavesdropping, copy, quantum communication stability will not be achieved. "In this sense, quantum can be said to be as long as the presence of the enemy and will not do, and such a system, and eventually be reduced to decoration. ”
Yuan Lan Feng said in the process of quantum communication and quantum were measured mutations that occur when communication both sides once the changes will stop traffic, so eavesdropping will obstruct communication. But this does not mean that quantum communication useless. In his view, first of all, such hostile block is a one-time second, compared with a safe but may be impeding the quantum communication objects, traditional communication should be smooth but it may leak. Compared with the traffic is blocked, leaking more desirable. Especially in the overriding safety factors in the special needs, quantum communication status is irreplaceable; again, when a quantum computer when practical, traditional communication becomes no secret at all. Until then, if there is no quantum communication means, China will have no choice.
"Therefore, no matter how many technical problems, quantum communication should, as the country's strategic direction, vigorously develop. This is not the difference between 80 and 90 points, but the difference between 0 and 1. Technical problems in quantum communication can be improved constantly in development, but is sure to do, do not do is definitely not. ”
On quantum communication has always been all dissenting voices and viewpoints, and even some of quantum computation and quantum communication, the entire subject of quantum information is treated as a pseudoscience. Yuan Lanfeng told the global Times newspaper, "to see the natural science, the top academic journals such as physical review letters, you will find many scientists around the world are engaged in quantum communications and quantum computing research. This is the focus of the scientific community in recent years development. These projects many times wins top ten scientific breakthroughs of the year, and gained international recognition. ”
"Quantum information researcher is not a closed group, on the contrary, they welcome questions about quantum information, constantly looking for all possible vulnerabilities and find ways to make up for it. "Yuan Lan feng, for example, safety of BB84 quantum cryptography protocols for proposed in 1984, has been questioned. Until 1999, to complete the security proof, published articles in the sciences, it is a landmark work. Later found out that most vulnerabilities from the measuring instrument, so they invented the safety and measuring instrument-independent quantum key distribution technology. This new technology was awarded the 2013 global physics top ten advances in 2014 and one of China's ten major scientific and technological advances. Yuan Lan Feng said, "it is against this constant questioning and refinement, all subject to continuous improvement. This is the practice of scientific research. "▲ [Global times Ni Hao]
Responsible editor: Zheng Hanxing
Article keywords:Quantum communication in China
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中国量子通信被批不靠谱 一旦遭干扰就成摆设|量子|通信|中国_新闻资讯
原标题：中国量子通信被批不靠谱：一旦遭干扰就成摆设
[环球网军事报道]8月16日凌晨，世界首颗量子科学实验卫星“墨子”号成功发射升空，中国将得以在世界上首次实现卫星和地面之间的量子通信。但围绕着量子通信的争议并没有中断，网上随即出现了一些质疑量子通信的说法。中国科学技术大学合肥微尺度物质科学国家实验室副研究员袁岚峰17日接受《环球时报》采访时表示，量子通信正是在质疑中发展壮大的，但技术性质疑不能阻止发展量子通信的战略方向。
量子不可复制的特性，是量子通信安全性的根本来源。窃听者如果想拦截量子信号，就要对其进行测量，而这将破坏携带密钥信息的量子态，从而被发现。因此理论上，这种不可窃听不可复制的信息传输方式，可以保证信息传输的绝对安全，这是唯一一种从物理上保证信息安全的方式，和过去以计算复杂性为基础的传统密码通信相比要高明得多。
但有人质疑，“看似无懈可击的量子通信方式，实际上是以牺牲信息稳定性为代价的”。因为一旦存在敌方任何形式的入侵行为，不管是窃听、复制还是干扰，稳定的量子通信都将无法实现。“从这个意义上说，量子通信可以说是只要有敌方存在就办不了事，而这样的系统，最终也只能沦为摆设。”
袁岚峰表示，在量子通信过程中，量子被测量时会发生状态的突变，通信双方一旦发现状态有变就会停止通信，因此窃听确实会阻挠通信。但这并不等于说量子通信没有用。他认为，首先，这种敌对的阻挠是一次性的；其次，跟安全但可能被阻挠的量子通信比较的对象，应该是畅通但可能泄密的传统通信。与通信被阻断相比，泄密更不可取。尤其是在安全性因素压倒一切的特殊需求中，量子通信的地位无可替代；再次，当量子计算机实用化时，传统通信会变成完全无密可言。到那时，如果没有量子通信的手段，中国将会无从选择。
“因此，无论有多少技术性的问题，量子通信都应该作为国家的战略方向，大力去发展。这不是80分和90分的区别，而是0和1的区别。量子通信的技术性问题可以在发展中不断改进，但前提是一定要去做，不做是肯定不行的。”
关于量子通信历来存在各种各样反对的声音和观点，甚至有些观点把量子通信与量子计算，即整个量子信息学科，都视为伪科学。袁岚峰告诉《环球时报》记者，“去看看《自然》《科学》《物理评论快报》等顶级学术期刊，会发现全球很多科学家都在从事量子通信和量子计算方面的研究。这是近年来科学界的重点发展领域。这些项目多次入选年度十大科学突破等，得到国际的公认。”
“量子信息的研究者并不是一个封闭的团体，正相反，他们欢迎对量子信息的质疑，不断寻找所有可能的漏洞，再找办法弥补。”袁岚峰举例说，1984年提出的BB84量子密码协议是否安全，一直都有人质疑。直到1999年，才完成安全性证明，文章发表在《科学》上，这是一个里程碑式的工作。后来发现大部分漏洞来自于测量仪器，所以又发明了安全性与测量仪器无关的量子密钥分发技术。这个新技术被评为2013年全球物理学十大进展和2014年中国十大科技进展之一。袁岚峰称，“正是在这种不断的质疑与改进中，整个学科才不断进步。这是科学研究的通例。”▲[环球时报记者 倪浩]
责任编辑：郑汉星
文章关键词： 量子 通信 中国
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