Chinese Scientists Make Breakthrough in Quantum Computing

[Han Patriot]

Did I just read someone by the name of @Bussard Ramjet mentioned that the US decided to go underground with quantum research because it appeared to resemble what the US did with the nuclear bomb research? LOL That is one biggest joke I ever heard. LOL

He is basically putting quantum research (no real threat) on the same level as making a nuclear bomb research. The reason the US went underground with nuke bomb research is due to the sensitivity of war at the time. Quantum research is not that dangerous to go underground about it. Beside any scientist would take every chance and opportunity to publish their research finding to get recognization and chance of winning prize.

Now the real reality is that n term of Quantum Research, there are only 2 countries in the race, China and the USA. Everyone is a distant 2nd. Who lead this race remains to be seen. But the USA is as clueless about making a universal quantum computer as we do. There are many challenges just as making a commercialized fusion reactor. But in the quantum communication, China is way ahead of the game.

Yes, our genius@Bussard Ramjet is saying quantum research just went underground ala Manhattan Project. Funny, I still see IBM annoucing this:
http://it-online.co.za/2017/05/08/quantum-computing-will-change-our-outlook/
If it's going silo mode, why are they announcing this? LOL. This is a typical Indy genius.

 

[Fledgingwings]

No wonder USA complained to China about hacking.these Chinese machines are dominating western concept of modern day computing capabilities.

 

[cirr]

中国造出了一台量子计算机吗？不，是两台。

原创 2017-05-09 张文卓 中科院之声

先说结论：

2017年5月3日，中科院—阿里巴巴量子计算联合实验室发布了我国在量子计算领域的最新成果，即一台10量子比特的超导电路量子计算原型机，以及一台在“玻色子取样”计算上超越了早期经典计算机能力的光量子模拟机。两台都分别创造了本领域的世界纪录，使人类离实用性量子计算机梦想又进了一步。研究团队由中国科学技术大学领衔，浙江大学、中科院物理所等单位参与其中。

下面说解读：

量子计算机利用量子力学中的叠加态原理，能做到真正意义的并行计算，达到传统计算机无法触及的计算速度，因此被誉为下一次信息革命的标志。本文将介绍一下量子计算机的分类和进展，让读者们有一个整体的印象。

1、不同物理系统的量子计算机

物理学家在上个世纪90年代提出了Shor算法和Grover算法等一些量子计算算法，论证了量子计算机的优势，那么之后最主要的问题就是如何在物理上实现它。有两个最重要的指标决定着量子计算机的成败：一个是量子退相干时间，另一个是可扩展性。“退相干”指的是量子相干态与环境作用演化到经典状态的时间。量子计算必需在量子相干态上进行，因此量子计算机的退相干时间越长越好；“可扩展性”指的是系统上可以增加更多的量子比特，从而才能走向实用化量子计算机。和经典计算机的简单增加比特不同，量子计算机需要把量子比特都耦合起来，因此难度是指数的，每增加一个比特，难度都要翻番。

这张表展示了不同物理系统量子计算机方案的区别：

（1）离子阱方案是量子计算机提出最早的方案，用囚禁的离子的能级和振动模式作为量子比特，技术上较为成熟，但可扩展性有限，限制了它向实用化量子计算机的发展。在这个方向上奥地利因斯布鲁克大学和美国科罗拉多大学世界领先。

（2）光量子方案利用的是单光子做量子比特，通过复杂光路系统来做计算。它的退相干时间和可扩展性也有着一定的限制，在这个方向上中国科学技术大学的潘建伟院士团队一直在世界上领先。

（3）核磁共振方案用到的是小分子的原子核做量子比特，它有着出色的退相干时间，但是单个分子的大小完全限制了可扩展性。在这个方向上探索量子计算机的努力已经不再是热点。

（4）超导电路方案是利用了超导体中的约瑟夫森结来产生量子比特，虽然退相干时间短，但是在可扩展性上一枝独秀，于是IBM，Google等信息巨头们大力投资这个方向。Google投资加州大学圣芭芭拉分校（UCSB）的Martinis团队成立了Google-UCSB联合实验室；阿里巴巴集团投资了潘建伟院士团队，在中国科学技术大学上海研究院成立了中科院—阿里巴巴量子计算联合实验室。

（5）金刚石方案利用金刚石中的色心缺陷（也就是不那么完美的钻石）做量子比特，在退相干时间和可扩展性上受到了样品本身的限制。这个方向上中国科学技术大学的杜江峰院士团队世界领先。

（6）超冷原子方案与离子阱方案比较相似，可扩展性有限。目前更多的是用来做凝聚态系统的量子模拟，这个领域世界领先的是德国马普量子光学所，美国JILA，哈佛-麻省理工冷原子中心等。

还有其它一些物理系统，在可扩展性方面都无法与超导电路相比。物理学家和IT巨头们都把未来实用化量子计算机的期望寄托在了这个系统上。

2、通用型量子计算机和专用型量子计算机

通用型量子计算机指的是利用量子逻辑门控制量子比特来做量子计算。它可以看作是数字化（digital）的量子计算机。理论上证明通过受控非门（CNOT gate）的组合就可以实现任意的量子逻辑过程。未来实用化的量子计算机一般都指这样的通用型量子计算机。

但是通用型量子计算机需要大量的量子比特和量子逻辑门，对物理系统的可扩展性要求很高（这也是超导电路方案在通用型中胜出的原因）。同时由于量子比特必需经过逻辑门幺正演化，某种程度上量子叠加态的威力也打了折扣。为了让更早地让量子计算机展现出它的优势，物理学家们想到了针对一些特殊的问题，可以用专用量子计算机来解决。这些专用型量子计算机可以不需要逻辑门，只靠自身系统的特点通过模拟的方式来针对性地解决问题，因此专用型量子计算机也被称为量子模拟机。

专用型量子计算机在解决一些问题上已经凸显了优势。比如加拿大的D-Wave公司研制的就是用绝热量子算法的来寻找基态（极小值）的专用型量子计算机，目前最新的D-Wave量子计算机已经声称在寻找极小值的问题上超过了所有经典计算机。

玻色子采样是另一个特殊问题，它和我们小时候玩过的一种撒小球装置有点像（见图1），可以演示统计分布。但区别在于这些小球都换成了不可区分的玻色子，并且在路径上会发生干涉，那么计算玻色子从入口到出口的概率分布的计算量会随着玻色子的增加变得非常大，这对经典计算机来说是一个很难的问题。但是一些专用型量子计算机可以用自身的玻色子来直接模拟这个问题，不需要一个个来计算，这样就具备了很大的优势。

图1、玻色子采样示意

中国科学技术大学（中科院-阿里巴巴实验室）刚刚发布的这台光量子计算机，就是利用了光量子本身是玻色子的特性，直接在光路上用5个光量子模拟了玻色子采样问题。它在这个问题上的计算速度已经超越了早期的经典计算机（比历史上第一台电子管计算机（ENIAC）和第一台晶体管计算机（TRADIC）运行速度快10到100倍）。团队计划年底前将干涉的光量子数增加到20，如果未来光量子数增加到50个，将一举超越目前世界上最快的超级计算机在玻色子采样问题上的计算速度。

下面这张表列出了不同的物理系统在通用型量子计算机和专用型量子计算机上的进展，其中标粗体的是5年内的最新成果。通过这张表，可以一目了然地看到Google的量子计算机，IBM的量子计算机，D-Wave的量子计算机，以及中国科学技术大学最新发布的两台量子计算机（即标注了中科院-阿里巴巴实验室）它们之间的关系：

从这个表中还可以看出一个趋势，那就是通用型量子计算机已经逐渐形成了超导电路方案的一家独大，而其它的方案大多都转向了专用型量子计算机。Google在今年年初提出了“量子霸权”这一目标，力争年底之前在超导电路上实现49个量子比特的操作。我们自然不甘落后，提出了一个小目标：年底前在超导电路上实现20个量子比特的操作。

这两台量子计算机也宣告了中国除了量子通信之外，在量子计算上也同样处于世界领跑地位。在光量子计算方案上，我们一路领先，朝着更大的玻色子采样机努力。在超导电路方案上，我们和Google并肩前行，一同向着实用化量子计算机的目标进发。

作者系中国科学院量子信息与量子科技前沿卓越创新中心、中国科学技术大学上海研究院科研人员

http://mp.weixin.qq.com/s/LK2PKjMq7WgesQbDB7EbJA

@Bussard Ramjet Time to learn Chinese

 

[Bussard Ramjet]

Did I just read someone by the name of @Bussard Ramjet mentioned that the US decided to go underground with quantum research because it appeared to resemble what the US did with the nuclear bomb research? LOL That is one biggest joke I ever heard. LOL

He is basically putting quantum research (no real threat) on the same level as making a nuclear bomb research. The reason the US went underground with nuke bomb research is due to the sensitivity of war at the time. Quantum research is not that dangerous to go underground about it. Beside any scientist would take every chance and opportunity to publish their research finding to get recognization and chance of winning prize.

Now the real reality is that n term of Quantum Research, there are only 2 countries in the race, China and the USA. Everyone is a distant 2nd. Who lead this race remains to be seen. But the USA is as clueless about making a universal quantum computer as we do. There are many challenges just as making a commercialized fusion reactor. But in the quantum communication, China is way ahead of the game.

All of what you have said is totally and completely wrong.

1. Quantum research is no threat? LOL. You don't seem to know a thing about quantum research do you? Quantum IT can in fact be a bigger threat than nuclear bombs. If a person today has a quantum computer, they can break ANY AND EVERY classical encryption! That means your opponent country can in no way possible have secure communications.
2. US went underground with nuclear bomb due to war? Not entirely correct. In fact they went underground in the late 30s, when US was not even in the war.
3. Also, US and West has went underground with many many kinds of research even in peace time. Look at the whole development of internet. In fact, internet pretty much directly comes from DARPA's secret research.
4. Also, you don't seem to know how science works. People in defense related sectors routinely forego any prize. In fact the RSA encryption that encrypts almost the whole internet, was first invented at UK secret service agency.
5. Again the moniker of "Quantum Research." There is nothing like that. Quantum Mechanics is the foundation of science today, and it involves essentially everything. China is extremely weak in many fields of Quantum Mechanics, specially theoretical Quantum Mechanics.
6. For our purposes what matters are four things: Quantum Computing, Quantum Cryptography/Communications, Quantum Sensors/Materials, and Quantum Computational Theory/Algorithms.
7. Of these four fields, China is world class and one among leaders in only Quantum Cryptography. It is actually totally absent from Quantum Computational Theory/Algorithms. And it is some distance behind US in Quantum Computing.

No wonder USA complained to China about hacking.these Chinese machines are dominating western concept of modern day computing capabilities.

LOL. People keep showing they know nothing about computing.

This so called computer (It isn't. It is a non-universal quantum simulator, only capable of doing Boson Sampling, and nothing else) has a speed of 5k-50k flops.

MY PC that I am using runs on a speed of Gflops. Meaning it is around 5 to 6 orders of magnitudes faster than this so called quantum computer.

Yes, our genius@Bussard Ramjet is saying quantum research just went underground ala Manhattan Project. Funny, I still see IBM annoucing this:
http://it-online.co.za/2017/05/08/quantum-computing-will-change-our-outlook/
If it's going silo mode, why are they announcing this? LOL. This is a typical Indy genius.

IMB is a private civilian company.

Defense research is not usually done by such companies.

 

[xunzi]

All of what you have said is totally and completely wrong.

1. Quantum research is no threat? LOL. You don't seem to know a thing about quantum research do you? Quantum IT can in fact be a bigger threat than nuclear bombs. If a person today has a quantum computer, they can break ANY AND EVERY classical encryption! That means your opponent country can in no way possible have secure communications.
2. US went underground with nuclear bomb due to war? Not entirely correct. In fact they went underground in the late 30s, when US was not even in the war.
3. Also, US and West has went underground with many many kinds of research even in peace time. Look at the whole development of internet. In fact, internet pretty much directly comes from DARPA's secret research.
4. Also, you don't seem to know how science works. People in defense related sectors routinely forego any prize. In fact the RSA encryption that encrypts almost the whole internet, was first invented at UK secret service agency.
5. Again the moniker of "Quantum Research." There is nothing like that. Quantum Mechanics is the foundation of science today, and it involves essentially everything. China is extremely weak in many fields of Quantum Mechanics, specially theoretical Quantum Mechanics.
6. For our purposes what matters are four things: Quantum Computing, Quantum Cryptography/Communications, Quantum Sensors/Materials, and Quantum Computational Theory/Algorithms.
7. Of these four fields, China is world class and one among leaders in only Quantum Cryptography. It is actually totally absent from Quantum Computational Theory/Algorithms. And it is some distance behind US in Quantum Computing.

LOL. People keep showing they know nothing about computing.

This so called computer (It isn't. It is a non-universal quantum simulator, only capable of doing Boson Sampling, and nothing else) has a speed of 5k-50k flops.

MY PC that I am using runs on a speed of Gflops. Meaning it is around 5 to 6 orders of magnitudes faster than this so called quantum computer.



IMB is a private civilian company.

Defense research is not usually done by such companies.

Once again, you prove to people how dumb you are with this nonsense.

1. You got to be joking with me if you think Quantum computer is bigger threat than an atomic bomb. At WORSE case, a proliferation of quantum computer only destroy the world economies BUT a proliferation of nuke has to potential TO END ALL HUMAN CIVILIZATION. Do you understand this difference?

2. The US already helping out the Allies BEFORE they even enter the War. Like I said, the US went underground after having the intelligence from the British that the Nazi Germany is also working on atomic bomb in the 1930s.

3. Like I said, you can make anything up with the US going underground. The same I can say about China going underground. So what you actually know about our quantum research progression may be just a small percentage publicly.

4. Quantum research is a whole new ball game so what previous tech encryption is irrelevant.

5. Once again, you prove you don't really know anything! Quantum Mechanics is still a theory and to put a theory into practical use required applied science and this is where China is extremely strong. Also how do you know China is weak in Quantum Mechanics? Are you telling me our scientists never study Quantum Mechanics? LOL Quantum Mechanics is widely study and available throughout the world.

6. You can make up anything you want. But like I said, the US is NOT leading in any quantum field and certainly not quantum computer. They are in the process of doing exactly what we did. Currently there is no working quantum computer that act like a traditional computer and won't be for a long time. It is however worth noting that China currently hold the record of controlling the most qubit in a quantum computer. This is the comparison and a good benchmark to see who so far is leading the race. The US can fool a country like India but against someone like China who already on the leading edge of quantum research, we know exactly where the US stand on their quantum research.

 

[Han Patriot]

All of what you have said is totally and completely wrong.

Quantum research is no threat? LOL. You don't seem to know a thing about quantum research do you? Quantum IT can in fact be a bigger threat than nuclear bombs. If a person today has a quantum computer, they can break ANY AND EVERY classical encryption! That means your opponent country can in no way possible have secure communications.

Nobody said Quantum technology is not important, otherwise why do you think China is investing heavily in it. Equating it to the Manhattan project is absurd. By your logic, DARPA shouldn't even let civilians get access to GPS since all missiles are guided by it. Again, all military in the world would keep a portion of research secret, but you are saying as if all American quantum research is going silo ala nuclear bomb in the 40s. So your logic is this, if China is announcing a breakthrough, the Americans are far ahead because their research had gone silo? Can I apply the same logic to American breakthroughs, so China is actually far ahead of everybody but because we are going silo, we are not announcing it? Hey why not include India who has practically zero ability in this field, India is actually ahead but they it's secret since Indians 'don't like' to brag.

1. US went underground with nuclear bomb due to war? Not entirely correct. In fact they went underground in the late 30s, when US was not even in the war.

They went silo when they saw the prospect of war and the possibility that Fascist Germany could be the first to own the bomb. The possibility of making an A bomb was only confirmed around 1938, the war started in 1939 genius.

The discovery of nuclear fission by German chemists Otto Hahn and Fritz Strassmann in 1938, and its theoretical explanation by Lise Meitner and Otto Frisch, made the development of an atomic bomb a theoretical possibility. There were fears that a German atomic bomb project would develop one first, especially among scientists who were refugees from Nazi Germany and other fascist countries.[2] In August 1939, Hungarian-born physicists Leó Szilárd and Eugene Wigner drafted the Einstein–Szilárd letter, which warned of the potential development of "extremely powerful bombs of a new type". It urged the United States to take steps to acquire stockpiles of uranium ore and accelerate the research of Enrico Fermi and others into nuclear chain reactions. They had it signed by Albert Einstein and delivered to President Franklin D. Roosevelt. Roosevelt called on Lyman Briggs of the National Bureau of Standards to head the Advisory Committee on Uranium to investigate the issues raised by the letter. Briggs held a meeting on 21 October 1939, which was attended by Szilárd, Wigner and Edward Teller. The committee reported back to Roosevelt in November that uranium "would provide a possible source of bombs with a destructiveness vastly greater than anything now known."[3]

[*]Also, US and West has went underground with many many kinds of research even in peace time. Look at the whole development of internet. In fact, internet pretty much directly comes from DARPA's secret research.[*]

It still doesn't prove that the Americans are going silo on quantum computing, are they secret programs? Who knows, there might be. Are you sure China doesn't have a secret program too?

Also, you don't seem to know how science works. People in defense related sectors routinely forego any prize. In fact the RSA encryption that encrypts almost the whole internet, was first invented at UK secret service agency.

Yah, only a genius like you knows how science works. By your logic we shouldn't even be doing research since this effort is futile and the Americans are all secretly far ahead. Ahh, we should learn from India, the best strategy is doing nothing.

Again the moniker of "Quantum Research." There is nothing like that. Quantum Mechanics is the foundation of science today, and it involves essentially everything. China is extremely weak in many fields of Quantum Mechanics, specially theoretical Quantum Mechanics.

OK, let me get this straight, someone creates a theory, then publish it, then a Chinese reads it, experiment with it and understands it. How does it make that Chinese weak?

For our purposes what matters are four things: Quantum Computing, Quantum Cryptography/Communications, Quantum Sensors/Materials, and Quantum Computational Theory/Algorithms.

Yah, you were talking about quantum everything, the apples and pears etc. Suddenly now, you create some hierarchy out of what I said.

[*]Of these four fields, China is world class and one among leaders in only Quantum Cryptography. It is actually totally absent from Quantum Computational Theory/Algorithms. And it is some distance behind US in Quantum Computing.

The are only 2 tangible field in the near future, telecoms and computers. How are you going to implement your 'theoretical algorithm' when the quantum computer is not even completed yet genius?

Quantum sensors, you mean like this one?
http://www.popsci.com/china-says-it-has-quantum-radar-what-does-that-mean

LOL. People keep showing they know nothing about computing.

This so called computer (It isn't. It is a non-universal quantum simulator, only capable of doing Boson Sampling, and nothing else) has a speed of 5k-50k flops.

MY PC that I am using runs on a speed of Gflops. Meaning it is around 5 to 6 orders of magnitudes faster than this so called quantum computer.

Yes, genius, the article explicitly mentioned it was 10 times faster than ENIAC. We get it. You seriously think you are the only one who can read English and access wikipedia?

IMB is a private civilian company.

Defense research is not usually done by such companies.

You have no idea on how DARPA works, isn't it?

Once again, you prove to people how dumb you are with this nonsense.

1. You got to be joking with me if you think Quantum computer is bigger threat than an atomic bomb. At WORSE case, a proliferation of quantum computer only destroy the world economies BUT a proliferation of nuke has to potential TO END ALL HUMAN CIVILIZATION. Do you understand this difference?

2. The US already helping out the Allies BEFORE they even enter the War. Like I said, the US went underground after having the intelligence from the British that the Nazi Germany is also working on atomic bomb in the 1930s.

3. Like I said, you can make anything up with the US going underground. The same I can say about China going underground. So what you actually know about our quantum research progression may be just a small percentage publicly.

4. Quantum research is a whole new ball game so what previous tech encryption is irrelevant.

5. Once again, you prove you don't really know anything! Quantum Mechanics is still a theory and to put a theory into practical use required applied science and this is where China is extremely strong. Also how do you know China is weak in Quantum Mechanics? Are you telling me our scientists never study Quantum Mechanics? LOL Quantum Mechanics is widely study and available throughout the world.

6. You can make up anything you want. But like I said, the US is NOT leading in any quantum field and certainly not quantum computer. They are in the process of doing exactly what we did. Currently there is no working quantum computer that act like a traditional computer and won't be for a long time. It is however worth noting that China currently hold the record of controlling the most qubit in a quantum computer. This is the comparison and a good benchmark to see who so far is leading the race. The US can fool a country like India but against someone like China who already on the leading edge of quantum research, we know exactly where the US stand on their quantum research.

I think this guy is troll masquerading as a rational and productive member. It's in their culture, they argue for the sake or arguing, there is no intention on knowing the truth. They cannot accept that India is far behind in this game. Ex: you maybe better than me but big bully Jim is still better than all, he has a secret weapon...

 

[terranMarine]

Well the funny chap said he will study computer science after getting the chemical engineering degree. Since all the groundbreaking and exciting sh!t are happening in the US our Indian genius should immediately pack his stuff and migrate as simple as that. He can keep on lecturing China about brain drain in the Wild Wild West

 

[cirr]

清华段路明研究组刷新量子存储容量国际记录

首次实现具有225个存储单元的原子量子存储器

清华新闻网5月9日电 清华大学量子信息中心段路明研究组在量子信息领域取得重要进展，首次实现具有225个存储单元的原子量子存储器，将量子存储器存储容量的国际记录提高了一个多数量级。该成果的研究论文《225个存储单元的量子存储器的实验实现》（“Experimental realization of a multiplexed quantum memory with 225 individually accessible memory cells”）近日发表于《自然·通讯》（Nature Communications）。

量子存储器二维存储阵列示意图。

量子存储器是实现长程量子通讯和量子计算机的重要部件。长程量子通讯需要量子中继器，以克服单光子信号在传输信道中的指数衰减问题。2001年，段路明与合作者提出DLCZ（Duan-Lukin-Cirac-Zoller)方案（《自然》414, 2001），利用原子量子存储器和单光子信道的结合以抑制衰减。该方案在量子信息领域引起很大反响，美国、中国、欧洲的多个研究组致力于在实验室上实现该方案，取得了系列重要进展。《现代物理评论》（Review of Modern Physics）和《自然》曾发表专文介绍相关进展，其中提高量子存储器的存储容量被认为是量子中继器实验实现方面的一个关键问题。

原子量子存储器阵列实验装置示意图。

此前，美国有研究组通过空间分波法，实现了12个存储单元的量子存储器。国内有研究组利用高维态空间的方法，实现了3到7维光信号的量子存储，该信号能编码2到3个量子比特。段路明研究组引入二维量子存储阵列的方法（如下图所示），大大提高了量子存储器的存储容量，将原子存储单元的数目增加到225个，比国际原有记录提高了近20倍。

实验演示任意原子存储单元与光子间的量子纠缠存储。

该实验利用二维可编程光路，近乎完美地保持了两百多个激光光路之间的相干性，从而为量子比特相干性和量子纠缠的存储提供了条件。实验利用DLCZ方案，实现了光子态与任意一对原子存储单元间量子纠缠的存储与读取，并证明各量子存储单元可以分别独立操作，避免了相互干扰。这些技术为高容量量子存储器的实现和量子中继器的发展奠定了基础，审稿人认为，“实现225个单元的量子存储是量子存储器实用化发展方面的一个重要里程碑”。

该论文第一作者为清华量子信息中心博士研究生濮云飞，通讯作者为段路明教授，其他作者包括交叉信息研究院博士研究生蒋楠、杨蒿翔、常炜、李畅。项目得到教育部、清华大学－“九州量子”量子网络联合实验室的经费支持。

清华大学量子信息中心成立于2011年，由世界著名计算机学家、2000年图灵奖得主姚期智院士领导，清华大学姚期智讲座教授段路明担任执行主任。近几年，清华量子信息中心在离子、金刚石、超导量子计算和全量子网络方面取得了系列创新成果，在《自然》《科学》《自然》子刊、《物理评论快报》等重要学术期刊发表论文数十篇。

论文链接：

https://www.nature.com/articles/ncomms15359

http://news.tsinghua.edu.cn/publish...144236239407235/20170509144236239407235_.html

@Bussard Ramjet

 

[bobsm]

Quantum Computing: The Future Of Computing Is Here, At Least In China; Highly Advanced Quantum Computer Model Developed
Trisha Jones
First Posted: May 05, 2017 04:40 AM EDT

The quantum computer developed by Chinese researchers is more efficient than all the existing supercomputers.
(Photo : Veritasium/YouTube screenshot)
A group of researchers from the University of Science and Technology, Hefei, Anhui province of China has developed a quantum computer that supposedly works 24,000 times faster than all the prevailing supercomputer models. The invention is said to be a giant leap toward bringing quantum computing -- the future of computing to the present.

According to leading physicists across the world, the principles of quantum physics can be employed in developing novel methods and tools of quantum computing. Such tools can enable the production of quantum computers models that can accomplish extremely complicated calculations simultaneously and efficiently viz. predicting the movements of subatomic particles.

The high-efficiency and accuracy of these computers is attributed to their capacity to maintain their system memory in a quantum state rather than in the form of zero and one of the binary system, India Times reported. More precisely, quantum computers employ the phenomenon of superposition and entanglement, basic quantum physics principles to store the data in the form of quantum bits or qubits.

The quantum computer developed by Chinese researchers uses the five-photon sampling and entanglement method, an advanced version of the single-photon sourcing used in the quantum computers developed by IBM and D-Wave. They managed to do so by building the components required for Boson sampling, the theoretically proposed method of developing high-efficiency quantum computers.

The prototype developed based on this technology involves the inclusion of more number of photons. Doing so enhances the speed and efficiency of the quantum computer, PCWorld reported.

The only technical discrepancy of the developed quantum computer prototype is the fact that qubits are extremely fragile. The unstable nature of these qubits can cause their degradation during the process of entanglement, hence compromising the accuracy and efficiency of the computer.

Therefore, upscaling the production of such computers necessitates stabilizing the qubits. Once stabilized, these quantum computers can easily outpace almost all existing supercomputers. If China manages to do so, it will be a huge technological advantage for the country.


http://www.scienceworldreport.com/a...here-china-highly-advanced-computer-model.htm

 

[Han Patriot]

清华段路明研究组刷新量子存储容量国际记录

首次实现具有225个存储单元的原子量子存储器

清华新闻网5月9日电 清华大学量子信息中心段路明研究组在量子信息领域取得重要进展，首次实现具有225个存储单元的原子量子存储器，将量子存储器存储容量的国际记录提高了一个多数量级。该成果的研究论文《225个存储单元的量子存储器的实验实现》（“Experimental realization of a multiplexed quantum memory with 225 individually accessible memory cells”）近日发表于《自然·通讯》（Nature Communications）。

量子存储器二维存储阵列示意图。

量子存储器是实现长程量子通讯和量子计算机的重要部件。长程量子通讯需要量子中继器，以克服单光子信号在传输信道中的指数衰减问题。2001年，段路明与合作者提出DLCZ（Duan-Lukin-Cirac-Zoller)方案（《自然》414, 2001），利用原子量子存储器和单光子信道的结合以抑制衰减。该方案在量子信息领域引起很大反响，美国、中国、欧洲的多个研究组致力于在实验室上实现该方案，取得了系列重要进展。《现代物理评论》（Review of Modern Physics）和《自然》曾发表专文介绍相关进展，其中提高量子存储器的存储容量被认为是量子中继器实验实现方面的一个关键问题。

原子量子存储器阵列实验装置示意图。

此前，美国有研究组通过空间分波法，实现了12个存储单元的量子存储器。国内有研究组利用高维态空间的方法，实现了3到7维光信号的量子存储，该信号能编码2到3个量子比特。段路明研究组引入二维量子存储阵列的方法（如下图所示），大大提高了量子存储器的存储容量，将原子存储单元的数目增加到225个，比国际原有记录提高了近20倍。

实验演示任意原子存储单元与光子间的量子纠缠存储。

该实验利用二维可编程光路，近乎完美地保持了两百多个激光光路之间的相干性，从而为量子比特相干性和量子纠缠的存储提供了条件。实验利用DLCZ方案，实现了光子态与任意一对原子存储单元间量子纠缠的存储与读取，并证明各量子存储单元可以分别独立操作，避免了相互干扰。这些技术为高容量量子存储器的实现和量子中继器的发展奠定了基础，审稿人认为，“实现225个单元的量子存储是量子存储器实用化发展方面的一个重要里程碑”。

该论文第一作者为清华量子信息中心博士研究生濮云飞，通讯作者为段路明教授，其他作者包括交叉信息研究院博士研究生蒋楠、杨蒿翔、常炜、李畅。项目得到教育部、清华大学－“九州量子”量子网络联合实验室的经费支持。

清华大学量子信息中心成立于2011年，由世界著名计算机学家、2000年图灵奖得主姚期智院士领导，清华大学姚期智讲座教授段路明担任执行主任。近几年，清华量子信息中心在离子、金刚石、超导量子计算和全量子网络方面取得了系列创新成果，在《自然》《科学》《自然》子刊、《物理评论快报》等重要学术期刊发表论文数十篇。

论文链接：

https://www.nature.com/articles/ncomms15359

http://news.tsinghua.edu.cn/publish...144236239407235/20170509144236239407235_.html

@Bussard Ramjet

I believe back in 2013, China developed the world's first quantum memory for a single photon.
https://www.technologyreview.com/s/...e-shape-of-a-single-photon-unveiled-in-china/

 

[cirr]

China’s New Type of Quantum Computing Device, Built Inside a Diamond

By Natalie Brown

May 11, 2017



A new quantum computing process has been developed by a team of Chinese researchers that may one-day help crack complex digital algorithms used in encryption. It involves using diamonds to break encryption and could be used in quantum code-breaking in the not too distant future.

The new type of quantum device was built inside a diamond in order to break down the number 35 into its factors of five and seven. Led by quantum physicist Professor Du Jiangfeng, the development of this new process may be just what we need to crack the encryption. Du Jiangfeng and team fired lasers ad microwave beams at particles inside the diamond’s “nitrogen-vacancy center”. Results from the experiment demonstrated that the particles locked inside the diamond were able to yield the solution in just two microseconds.

Quantum computers are extremely powerful tools that can solve complex equations in fractions of a second, hence why so many people are trying to be the first to develop a workable model. Not only will they be responsible for achieving one of the greatest feats in all of history, but they’ll also make a lot of money from it too.

In a similar experiment, researchers from Sandia National Laboratories in New Mexico and Harvard University embedded two silicon atoms in a diamond matrix in order to demonstrate how to successfully bridge quantum computers on an atomic level. Here, the team used an ion beam implanter to swap over the diamond’s carbon atom with a larger silicon atom. With regards to the Chinese experiment, it’s the first time researchers factorized a number built on solid material and could even favor certain numbers of six or more digits.

http://trendintech.com/2017/05/11/c...ntum-computing-device-built-inside-a-diamond/

@Bussard Ramjet

This Chinese quantum computing device built inside a diamond could one day crack digital encryption technologies

The newly invented quantum computing process, dubbed "factorization," could one day help crack the complex digital algorithm use in encryption today.

Kukil Bora

May 8, 2017 21:04 IST

[Representational Image] Reseachers are experimenting with a new type of quantum computing device, built inside a diamond, that can break down the number 35 into its factors.REUTERS/Stefan Wermuth


A Chinese team of researchers is busy experimenting on device, using diamonds, which can make quantum code-breaking a possibility in near future. If successful, the experiment will result in a new technology that can put the digital encryption tools protecting banks, governments and the military data to shame.

Quantum physicists in Hefei, Anhui province used a new type of quantum computing device built inside a diamond to break down the number 35 into its factors – the numbers five and seven. The researchers believe that the newly invented process, dubbed "factorization," could one day help crack the complex digital algorithm use in encryption today.

As part of the experiment, the team of researchers led by quantum physicist Professor Du Jiangfeng at the University of Science and Technology of China fired laser and microwave beams at particles locked inside the diamond's "nitrogen-vacancy centre" – an ideal space for subatomic interaction to occur.


According to the researchers, the particles trapped inside the diamond yield the solution in just two microseconds, which is even quicker than a lightning strike.

How powerful a quantum computer could be?

The popular RSA algorithm, which is used by modern computers to encrypt and decrypt messages, makes use of the product of two large prime numbers to encrypt a message. While it's impossible to decode by people who don't know the two prime numbers, even computers with enormous amount of digital computing power will take thousands of years to determine the prime numbers.

However, a quantum computer could theoretically solve this puzzle in just a second. Now that's the computing power researchers all around the world are striving to achieve.

Researchers from the same university also recently claimed that they have built the world's first quantum computing machine, which is said to be 24,000 times faster than its international counterparts.

In a similar experiment, researchers at Sandia National Laboratories in Albuquerque, New Mexico, and Harvard University managed to embed two silicon atoms in a diamond matrix to demonstrate a technique for connecting, or "bridging," quantum computers at an atomic scale.

To make this happen, the researchers used something called an "ion beam implanter" to replace a carbon atom of the diamond with the larger silicon atom. The process ensured that the electrons' responses in the silicon atom are not clouded by unwanted interactions with other matter.

When it comes to the latest Chinese experiment, this was the first time that researchers managed to factorise a number in a stable setting built on solid material. The researchers also claimed that their device was capable of factoring certain types of numbers of six digits or even higher.

"And it is scalable, which is a huge advantage of our system," one of the researchers said.

http://www.ibtimes.co.in/this-chine...could-one-day-crack-digital-encryption-725961

 

[Han Patriot]

@Bussard Ramjet

This Chinese quantum computing device built inside a diamond could one day crack digital encryption technologies

The newly invented quantum computing process, dubbed "factorization," could one day help crack the complex digital algorithm use in encryption today.

Kukil Bora

May 8, 2017 21:04 IST

[Representational Image] Reseachers are experimenting with a new type of quantum computing device, built inside a diamond, that can break down the number 35 into its factors.REUTERS/Stefan Wermuth


A Chinese team of researchers is busy experimenting on device, using diamonds, which can make quantum code-breaking a possibility in near future. If successful, the experiment will result in a new technology that can put the digital encryption tools protecting banks, governments and the military data to shame.

Quantum physicists in Hefei, Anhui province used a new type of quantum computing device built inside a diamond to break down the number 35 into its factors – the numbers five and seven. The researchers believe that the newly invented process, dubbed "factorization," could one day help crack the complex digital algorithm use in encryption today.

As part of the experiment, the team of researchers led by quantum physicist Professor Du Jiangfeng at the University of Science and Technology of China fired laser and microwave beams at particles locked inside the diamond's "nitrogen-vacancy centre" – an ideal space for subatomic interaction to occur.


According to the researchers, the particles trapped inside the diamond yield the solution in just two microseconds, which is even quicker than a lightning strike.

How powerful a quantum computer could be?

The popular RSA algorithm, which is used by modern computers to encrypt and decrypt messages, makes use of the product of two large prime numbers to encrypt a message. While it's impossible to decode by people who don't know the two prime numbers, even computers with enormous amount of digital computing power will take thousands of years to determine the prime numbers.

However, a quantum computer could theoretically solve this puzzle in just a second. Now that's the computing power researchers all around the world are striving to achieve.

Researchers from the same university also recently claimed that they have built the world's first quantum computing machine, which is said to be 24,000 times faster than its international counterparts.

In a similar experiment, researchers at Sandia National Laboratories in Albuquerque, New Mexico, and Harvard University managed to embed two silicon atoms in a diamond matrix to demonstrate a technique for connecting, or "bridging," quantum computers at an atomic scale.

To make this happen, the researchers used something called an "ion beam implanter" to replace a carbon atom of the diamond with the larger silicon atom. The process ensured that the electrons' responses in the silicon atom are not clouded by unwanted interactions with other matter.

When it comes to the latest Chinese experiment, this was the first time that researchers managed to factorise a number in a stable setting built on solid material. The researchers also claimed that their device was capable of factoring certain types of numbers of six digits or even higher.

"And it is scalable, which is a huge advantage of our system," one of the researchers said.

http://www.ibtimes.co.in/this-chine...could-one-day-crack-digital-encryption-725961

Less than a month after the breakthrough and we created a new quantum computing method.
@Bussard Ramjet

Hey I bet US has got a more advanced version underground. Right my indy bhai?

 

[Bussard Ramjet]

Less than a month after the breakthrough and we created a new quantum computing method.
@Bussard Ramjet

Hey I bet US has got a more advanced version underground. Right my indy bhai?

Extremely busy these days. Will reply to you when I am free.

The only thing I will say is that such random articles about one or two achievements is misleading. There is a huge research community, all do very different kinds of things.

I will expound in detail later.

 

[Han Patriot]

Extremely busy these days. Will reply to you when I am free.

The only thing I will say is that such random articles about one or two achievements is misleading. There is a huge research community, all do very different kinds of things.

I will expound in detail later.

OK, waiting for you genius input to downplay all these achievements. Are you still in school? LOL

 

[GS Zhou]

A typical response from our talented chemical engineering student again. If it is a new breakthrough made by American scientist, he will claim this as a new convincing proof about US's "indisputable leadership in quantum science"; but now this is something done by China, hmmm, this is nothing but "such random articles about one or two achievements is misleading".

What a genius!