China has built world's first and biggest integrated quantum communication network that covering 4600km in distance

[khansaheeb]

Don't you understand it is exactly done by the Chinese quantumn satellite Mozi?
View attachment 704675

It seems the original post is a report of previous work and repackaged as novel current achievement. I would need to sit down and research all the papers to get a true historical timeline, but I don't have time. It also seems the Chinese have been working in collaboration with other countries and failed to mention this in the original post.

 

[GS Zhou]

It seems the original post is a report of previous work and repackaged as novel current achievement. I would need to sit down and research all the papers to get a true historical timeline, but I don't have time. It also seems the Chinese have been working in collaboration with other countries and failed to mention this in the original post.

Honestly I don't know what you want to prove or disapprove.

1. China launches the quantumn communication satellite in 2016;
2. lots of tests are conducted after that, incl. the ones co-done with Australia, where we put the quantum key receiving device in Australia to test the Mozi satellite's capability to do "cross-continent" task.
3. Now the Mozi satellite is proved to be working well, and the land-based quantumn network is also completed and tested, and even put to many real-world activities, e.g. banking,
4. After all the tests, building, real-world applications are done, we announce the completion of the world first and integrated quantum network. Tell us anything in appropriate here?

For the comment "Chinese have been working in collaboration with other countries and failed to mention this in the original post."

If you really read the article I shared, it won't be difficult to find the following:

 

[Pakistan Space Agency]

Congratulations and well done.

 

[khansaheeb]

Honestly I don't know what you want to prove or disapprove.

1. China launches the quantumn communication satellite in 2016;
2. lots of tests are conducted after that, incl. the ones co-done with Australia, where we put the quantum key receiving device in Australia to test the Mozi satellite's capability to do "cross-continent" task.
3. Now the Mozi satellite is proved to be working well, and the land-based quantumn network is also completed and tested, and even put to many real-world activities, e.g. banking,
4. After all the tests, building, real-world applications are done, we announce the completion of the world first and integrated quantum network. Tell us anything in appropriate here?

For the comment "Chinese have been working in collaboration with other countries and failed to mention this in the original post."

If you really read the article I shared, it won't be difficult to find the following:
View attachment 704678

All I am saying is that the title of the post is misleading and that China was not the first to create a
integrated quantum communication network. It is a simple statement of fact which your indoctrinated mindset cannot accept.

 

[GS Zhou]

All I am saying is that the title of the post is misleading and that China was not the first to create a
integrated quantum communication network. It is a simple statement of fact which your indoctrinated mindset cannot accept.

Sorry it's you that keep posting nonsense.

The article gives a very proper explanation about "integrated network ", it also shows the thanks to the partner countries. But it's you that keep posting nonesense, even without reading the full article, which won't cost you more than 90 seconds.

 

[samsara]

A similar article yet more complete in content, as well as provides better clarity!!! Even the attached image is of higher resolution The phys one is derived from this article and was redacted unnecessarily to omit some portion!

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China Builds the World’s First Integrated Quantum Communication Network

TOPICS: Popular Quantum Information Science Telecommunications University Of Science And Technology Of China

By University of Science and Technology of China -- January 6, 2021

Chinese scientists have established the world’s first integrated quantum communication network, combining over 700 optical fibers on the ground with two ground-to-satellite links to achieve quantum key distribution over a total distance of 4,600 kilometers for users across the country. Credit: University of Science and Technology of China

Chinese scientists have established the world’s first integrated quantum communication network, combining over 700 optical fibers on the ground with two ground-to-satellite links to achieve quantum key distribution over a total distance of 4,600 kilometers for users across the country. The team, led by Pan Jianwei, Chen Yuao, Peng Chengzhi from the University of Science and Technology of China in Hefei, reported in Nature their latest advances towards the global, practical application of such a network for future communications.

Unlike conventional encryption, quantum communication is considered unhackable and therefore the future of secure information transfer for banks, power grids and other sectors. The core of quantum communication is quantum key distribution (QKD), which uses the quantum states of particles — e.g. photons — to form a string of zeros and ones, while any eavesdropping between the sender and the receiver will change this string or key and be noticed immediately. So far, the most common QKD technology uses optical fibers for transmissions over several hundred kilometers, with high stability but considerable channel loss. Another major QKD technology uses the free space between satellites and ground stations for thousand-kilometer-level transmissions. In 2016, China launched the world’s first quantum communication satellite (QUESS, or Mozi/Micius) and achieved QKD with two ground stations which are 2,600 km apart. In 2017, an over 2,000-km-long optical fiber network was completed for QKD between Beijing and Shanghai.

Using trusted relays, the ground-based fiber network and the satellite-to-ground links were integrated to serve more than 150 industrial users across China, including state and local banks, municipal power grids, and e-government websites. “Our work shows that quantum communication technology is sufficiently mature for large-scale practical applications,” said Pan Jianwei, Professor of USTC. Similarly, a global quantum communication network can be established if national quantum networks from different countries are combined, and if universities, institutions and companies come together to standardize related protocols, hardware, etc., he added.

In the last couple of years, the team extensively tested and improved the performance of different parts of the integrated network. For instance, with an increased clock rate and more efficient QKD protocol, the satellite-to-ground QKD now has an average key generation rate of 47.8 kilobits per second, which is 40 times higher than the previous rate. The researchers have also pushed the record for ground-based QKD to beyond 500 kilometers using a new technology called twin-field QKD (TF-QKD).

Next up, the team will further expand the network in China and with their international partners from Austria, Italy, Russia and Canada. They also aim to develop small-scale, cost-efficient QKD satellites and ground-based receivers, as well as medium and high earth orbit satellites to achieve all-time, ten-thousand-km-level QKD.

Reference: 6 January 2021, Nature.
DOI: 10.1038/s41586-020-03093-8

Their work was supported by the National Development and Reform Commission of China, the provincial/municipal government of Shandong, Anhui, and Shanghai, China Banking Regulatory Commission, the Chinese Academy of Sciences, the Ministry of Science and Technology of China, and the National Science Foundation of China.

China Builds the World’s First Integrated Quantum Communication Network

Chinese scientists have established the world's first integrated quantum communication network, combining over 700 optical fibers on the ground with two ground-to-satellite links to achieve quantum key distribution over a total distance of 4,600 kilometers for users across the country. The team, led

scitechdaily.com

 

[khansaheeb]

Sorry it's you that keep posting nonsense.

The article gives a very proper explanation about "integrated network ", it also shows the thanks to the partner countries. But it's you that keep posting nonesense, even without reading the full article, which won't cost you more than 90 seconds.

You keep parroting the same thing and refuse to research a little in more depth. You are mixing fact and fiction and posting dubious titles and then trying to justify your claims. Your nationalism is tainting your judgment, independent thought and equanimous analysis.

 

[GS Zhou]

You keep parroting the same thing and refuse to research a little in more depth. You mixing fact and fiction and posting dubious titles and then trying to justify your claims. Your nationalism is tainting your judgment, independent thought and equanimous analysis.

At least I won't make any comment in any thread before I read the full article of the OP.

 

[TaiShang]

China's first homegrown quantum computer OS was unveiled in Hefei on Monday

By Global TimesPublished: Feb 08, 2021 09:03 PM

Photo:Sina Weibo
8
China’s first homegrown quantum computer operating system was unveiled in Hefei, E.China’s Anhui Province on Monday, showing that China's quantum software R&D capabilities have reached advanced intl levels.

China's first homegrown quantum computer OS was unveiled in Hefei on Monday - Global Times

www.globaltimes.cn