randomradio
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China Quantum Communiations Technology: Cryptography, Radar, Satellite, Teleportation, Network
- Thread starter cirr
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TheTheoryOfMilitaryLogistics
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The only thing that China can do is copy.
So I guess this radar system must have been stolen from A~san's masters.
Although I can't confirm which master(the westernmedia don't tell me),
I believe that I am the nearest person to truth.
So I guess this radar system must have been stolen from A~san's masters.
Although I can't confirm which master(the westernmedia don't tell me),
I believe that I am the nearest person to truth.
Jlaw
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Good one bro. You know a really bad secret. You know where Ipod originated from?
Apple took the MP3 player from a SG company Creative and rebrand it into the Ipod. But of course you will not hear this in western news about Americans copying. Americans are biggest copycat in the world.
TaiShang
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Good one bro. You know a really bad secret. You know where Ipod originated from?
Apple took the MP3 player from a SG company Creative and rebrand it into the Ipod. But of course you will not hear this in western news about Americans copying. Americans are biggest copycat in the world.
The late Steve Jobs used to praise copying and stealing.
I will take my hat off to their marketing ability.
But, on this quantum comm. platform, China has better keep a low key. No need to get others know every single details of your (military-related) achievements.
cirr
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Jlaw
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Too late....there's already a thread about it. Not sure why Chinese government want to leak this out
terranMarine
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China should not have leaked it, don't know why they did it though.
艹艹艹
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Because they have no other choice.
TaiShang
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Cute mockery.
I would say ignore it. It has nothing; no meat or substance, but just empty rhetoric.
You are already too big to fail.
Jlaw
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i believe you are right. Now F22 , F35 can easily be detected they are vulnerable like any other airplanes. Wasted money when they could spend on this:
and this:
The US government has a $20.4 trillion retirement problem
http://www.businessinsider.com/us-government-7-trillion-pension-shortfall-2016-4
cirr
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Teleportation, the next generation: Chinese and Canadian scientists closer to a quantum internet
Researchers teleport tiny photon particles across cities in breakthrough that could help future development of a faster, more secure ‘quantum internet’
PUBLISHED : Monday, 19 September, 2016, 11:02pm
UPDATED : Tuesday, 20 September, 2016, 9:36am
Stephen Chen
Chinese and Canadian scientists say they have successfully carried out a form of teleportation across an entire city.
The two teams working independently have teleported near-identical versions of tiny particles called photons through cables across Calgary in Canada and Hefei in Anhui province.
The forms of teleported photons were destroyed in one laboratory and recreated in another more than 8km apart in the two cities through optical fibre.
Similar experiments have been carried out before, but only within the same laboratory.
A physicist not involved in either of the studies said the research was a step forward in the development of a “quantum internet”, a futuristic particle-based information system that could be much more secure than existing forms of digital data.
Quantum networks make eavesdropping almost impossible because the particles used cannot be observed without being altered.
Teleportation, the foundation for such a network, has largely been the realm of science fiction, and other scientists say the research is still a very long way from teleporting people or objects.
But in his commentary on the research in the scientific journal Nature Photonics, French physicist Frederic Grosshans said the two experiments clearly showed that teleportation across metropolitan distances was technologically feasible.
“The two papers demonstrate that the possibility of quantum [internet] networks that span a city are a realistic proposition, which is an exciting vision for the future,” Grosshans said.
Professor Zhang Qiang, one of the leaders of the Chinese team, said: “Maybe in the distant future, materials can be teleported through a fibre or even open space, too.”
The research was carried out by scientists at the University of Science and Technology of China and the University of Calgary and their papers were published in the journal on Monday.
The research concentrates on the behaviour of particles at a subatomic, or quantum level.
Researchers have long known that a photon particle can be split in two and yet the pair are still “entangled”, which means that any change in the state of one immediately affects the other, although how this happens is still unknown.
This, in theory, means it could be possible to transmit information by manipulating entangled photons, but various factors, including fluctuating temperatures, can interfere with the process over longer distances outside the laboratory.
The researchers used sophisticated equipment to counter these and other problems, allowing the Chinese team, led by Professor Pan Jianwei and Professor Zhang, to achieve “full” quantum teleportation of photons over a optical fibre network 12.5km apart.
The Canadian team led by Professor Wolfgang Tittel also teleported the particles over 8.2km. The teleported photons were a virtual copy of the original.
A team at the National Institute of Standards and Technology in the US reported last year that it had achieved quantum teleportation over a fibre optical network more than 100km in length, but the whole cable was coiled within a laboratory.
Scientists have also teleported photons through the air over 100km, but the technology can only be used at night and in remote areas because too many of the particles are generated by other sources including natural light.Using a cable shields the photons from interference and is viewed by researchers as a more practical way of harnessing the technology.
The Chinese and Canadian teams used different approaches to carry out their experiments. The Chinese team demonstrated a fuller version of the quantum network with higher reliability, but the Canadian approach was more efficient, according to Grosshans.
The Chinese method “comes at the price of a low rate of two teleported photons per hour, which would strongly limit its practical applications if it could not be improved”, he said.
The Canadian method “allows a faster teleportation rate of 17 photons per minute”, but their low accuracy during transmission “also limits its immediate practical applications”.
Zhang at the University of Science and Technology of China, said the team’s work was only a small step towards the construction of a quantum network.
Many technical hurdles, such as storage for the extremely fragile quantum data, remained and it was difficult to predict when a global quantum internet would be operational.
Grosshans said a useful quantum computer was still a few decades away and “the first ones, whether they will be built in 2030 or 2070 would be very expensive machines”.
China is at the forefront of research into quantum communications.
It is carrying out experiments on a satellite launched last month as part of efforts to develop a communications system that cannot be cracked by hackers.
The experiments involve attempting to transmit information through photons from the satellite to earth.
http://www.scmp.com/news/china/poli...nese-canadian-scientists-achieve-breakthrough
Researchers teleport tiny photon particles across cities in breakthrough that could help future development of a faster, more secure ‘quantum internet’
PUBLISHED : Monday, 19 September, 2016, 11:02pm
UPDATED : Tuesday, 20 September, 2016, 9:36am
Stephen Chen
Chinese and Canadian scientists say they have successfully carried out a form of teleportation across an entire city.
The two teams working independently have teleported near-identical versions of tiny particles called photons through cables across Calgary in Canada and Hefei in Anhui province.
The forms of teleported photons were destroyed in one laboratory and recreated in another more than 8km apart in the two cities through optical fibre.
Similar experiments have been carried out before, but only within the same laboratory.
A physicist not involved in either of the studies said the research was a step forward in the development of a “quantum internet”, a futuristic particle-based information system that could be much more secure than existing forms of digital data.
Quantum networks make eavesdropping almost impossible because the particles used cannot be observed without being altered.
Teleportation, the foundation for such a network, has largely been the realm of science fiction, and other scientists say the research is still a very long way from teleporting people or objects.
But in his commentary on the research in the scientific journal Nature Photonics, French physicist Frederic Grosshans said the two experiments clearly showed that teleportation across metropolitan distances was technologically feasible.
“The two papers demonstrate that the possibility of quantum [internet] networks that span a city are a realistic proposition, which is an exciting vision for the future,” Grosshans said.
Professor Zhang Qiang, one of the leaders of the Chinese team, said: “Maybe in the distant future, materials can be teleported through a fibre or even open space, too.”
The research was carried out by scientists at the University of Science and Technology of China and the University of Calgary and their papers were published in the journal on Monday.
The research concentrates on the behaviour of particles at a subatomic, or quantum level.
Researchers have long known that a photon particle can be split in two and yet the pair are still “entangled”, which means that any change in the state of one immediately affects the other, although how this happens is still unknown.
This, in theory, means it could be possible to transmit information by manipulating entangled photons, but various factors, including fluctuating temperatures, can interfere with the process over longer distances outside the laboratory.
The researchers used sophisticated equipment to counter these and other problems, allowing the Chinese team, led by Professor Pan Jianwei and Professor Zhang, to achieve “full” quantum teleportation of photons over a optical fibre network 12.5km apart.
The Canadian team led by Professor Wolfgang Tittel also teleported the particles over 8.2km. The teleported photons were a virtual copy of the original.
A team at the National Institute of Standards and Technology in the US reported last year that it had achieved quantum teleportation over a fibre optical network more than 100km in length, but the whole cable was coiled within a laboratory.
Scientists have also teleported photons through the air over 100km, but the technology can only be used at night and in remote areas because too many of the particles are generated by other sources including natural light.Using a cable shields the photons from interference and is viewed by researchers as a more practical way of harnessing the technology.
The Chinese and Canadian teams used different approaches to carry out their experiments. The Chinese team demonstrated a fuller version of the quantum network with higher reliability, but the Canadian approach was more efficient, according to Grosshans.
The Chinese method “comes at the price of a low rate of two teleported photons per hour, which would strongly limit its practical applications if it could not be improved”, he said.
The Canadian method “allows a faster teleportation rate of 17 photons per minute”, but their low accuracy during transmission “also limits its immediate practical applications”.
Zhang at the University of Science and Technology of China, said the team’s work was only a small step towards the construction of a quantum network.
Many technical hurdles, such as storage for the extremely fragile quantum data, remained and it was difficult to predict when a global quantum internet would be operational.
Grosshans said a useful quantum computer was still a few decades away and “the first ones, whether they will be built in 2030 or 2070 would be very expensive machines”.
China is at the forefront of research into quantum communications.
It is carrying out experiments on a satellite launched last month as part of efforts to develop a communications system that cannot be cracked by hackers.
The experiments involve attempting to transmit information through photons from the satellite to earth.
http://www.scmp.com/news/china/poli...nese-canadian-scientists-achieve-breakthrough
cirr
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CHINA SAYS IT HAS QUANTUM RADAR: WHAT DOES THAT MEAN?
STEALTH HUNTER
By Jeffrey Lin and P.W. Singer Yesterday at 7:00pm
World Champions
Shown here are engineers from China Electronics Technology Group Corporation (CETC)'s 14th Institute, who in September 2016 announced to have built the world's longest ranged quantum radar
China Electronics Technology Group Corporation (CETC), China's foremost military electronics company, has announced that its scientists have tested a quantum radar to the range of 100km, beating out known American and German competition by 500 percent. This is a significant claim to make, as a quantum radar would theoretically be able to detect stealth aircraft at long ranges.
While conventional radars transmit radio waves to reflect off of targets, a quantum radar instead uses entangled photons, via fiber couplers, quantum dots or other methods. The entangled photons bounce off of the targeted object back to the quantum radar, which can extrapolate the position, radar cross section, speed, direction and other properties of the targeted object from the return time of the photons. Also, attempts to spoof the quantum radar would be immediately noticed, since any attempt to alter or duplicate the entangled photons would be detected by the radar.
Because stealth aircraft are optimized for stealth against radio waves used by conventional radars, they would be much more susceptible to detection by the photon waves of a quantum radar. Additionally, the quantum radar could 'observe' on the composition of the target, since in the state of entanglement, the entangled photons remaining in the radar would show the same changes that transmitted photons would have when interacting with the target (known as quantum correlation). That would also be very valuable in missile defense, where one could differentiate between an actual nuclear warhead against inflatable decoys.
There is, of course, a wide difference between a claim of a laboratory "proof of concept" and the deployment of an actual working quantum radar. Indeed, US defense contractor Lockheed Martin has been attempting to build its own quantum radar for long range detection since 2007, with no public reports of deployment. A number of hurdles have to be overcome not just in making the system work, but also truly useful. A major obstacle towards an operational quantum radar is the problem of quantum decoherence; as a quantum system like entangled particles spends more time in the environment, the longer exposure to the outside environment will cause the quantum system to 'decay' (to lose its quantum behavior). This imposes range limitations on current quantum radar prototypes, since longer range equals more time spent exposed to its surroundings. While a 100km-range quantum radar may seem impressive by scientific research standards, the demands of air defense against stealth bombers or missiles would require a much greater range to be of optimal military use.
Whatever happens next with the quantum radar project, CETC's announcement is a useful reminder of both the impressive array of research activities in China and how breakthroughs in technology can quickly turn the tables on once powerful weapons.
http://www.popsci.com/china-says-it-has-quantum-radar-what-does-that-mean
STEALTH HUNTER
By Jeffrey Lin and P.W. Singer Yesterday at 7:00pm
World Champions
Shown here are engineers from China Electronics Technology Group Corporation (CETC)'s 14th Institute, who in September 2016 announced to have built the world's longest ranged quantum radar
China Electronics Technology Group Corporation (CETC), China's foremost military electronics company, has announced that its scientists have tested a quantum radar to the range of 100km, beating out known American and German competition by 500 percent. This is a significant claim to make, as a quantum radar would theoretically be able to detect stealth aircraft at long ranges.
While conventional radars transmit radio waves to reflect off of targets, a quantum radar instead uses entangled photons, via fiber couplers, quantum dots or other methods. The entangled photons bounce off of the targeted object back to the quantum radar, which can extrapolate the position, radar cross section, speed, direction and other properties of the targeted object from the return time of the photons. Also, attempts to spoof the quantum radar would be immediately noticed, since any attempt to alter or duplicate the entangled photons would be detected by the radar.
Because stealth aircraft are optimized for stealth against radio waves used by conventional radars, they would be much more susceptible to detection by the photon waves of a quantum radar. Additionally, the quantum radar could 'observe' on the composition of the target, since in the state of entanglement, the entangled photons remaining in the radar would show the same changes that transmitted photons would have when interacting with the target (known as quantum correlation). That would also be very valuable in missile defense, where one could differentiate between an actual nuclear warhead against inflatable decoys.
There is, of course, a wide difference between a claim of a laboratory "proof of concept" and the deployment of an actual working quantum radar. Indeed, US defense contractor Lockheed Martin has been attempting to build its own quantum radar for long range detection since 2007, with no public reports of deployment. A number of hurdles have to be overcome not just in making the system work, but also truly useful. A major obstacle towards an operational quantum radar is the problem of quantum decoherence; as a quantum system like entangled particles spends more time in the environment, the longer exposure to the outside environment will cause the quantum system to 'decay' (to lose its quantum behavior). This imposes range limitations on current quantum radar prototypes, since longer range equals more time spent exposed to its surroundings. While a 100km-range quantum radar may seem impressive by scientific research standards, the demands of air defense against stealth bombers or missiles would require a much greater range to be of optimal military use.
Whatever happens next with the quantum radar project, CETC's announcement is a useful reminder of both the impressive array of research activities in China and how breakthroughs in technology can quickly turn the tables on once powerful weapons.
http://www.popsci.com/china-says-it-has-quantum-radar-what-does-that-mean
