Quantum technology Part 2

Decoding China’s quantum satellite experiments

December 20, 2016

  • The quantum science satellite (QSS) program is the third mission of the 2011 Strategic Priority Program on Space Science that includes a series of satellite launches between 2015 and 2030 to explore black holes, dark matter, and cosmic background radiation. While the QSS will advance research on “quantum internet” – i.e. secure communications and a distributed computational power that greatly exceeds that of the classical internet, Micius’ experiments will also advance quantum cryptography, communications systems, and cyber capabilities that the China’s military requires for its sensors and future strike systems.


Can China’s quantum radar become even more powerful? Scientists may have found the key

15 December, 2016

  • Chinese researchers have conducted an experiment that could lead to a way to extend the range at which quantum radar systems can detect stealth aircraft. In a paper in the journal Physical Review Letters early this month, the team from the University of Science and Technology of China (USTC) in Hefei, Anhui province, detailed an experiment that showed for the first time that weak-value-based metrology, an emerging quantum measurement technique, could detect previously undetectable signals. A quantum physicist at Nanjing University in Jiangsu province, who was not involved in the research, cautioned that it was “laboratory work, not mature enough for immediate field deployment”, but added that it could “boost the range of quantum radar, among other things”.


Weak-value-based metrology surpasses classical limit

December 14, 2016

  • Now in a new study, physicists have experimentally demonstrated that a method designed to address this problem, called weak-value-based measurement, can, when strengthened by a recently proposed technique called power recycling, surpass the classical measurement limit and offer significant advantages for making ultra-precise quantum measurements. The researchers, led by Chuan-Feng Li and Guang-Can Guo at the University of Science and Technology of China, have published a paper on the new demonstration in a recent issue of Physical Review Letters.


Chinese physicists first produce quantum nonlocality from contextuality

Dec 1, 2016

  • Chinese physicists have experimentally produced quantum nonlocality from contextuality for the first time in the world, laying a foundation for the design of a quantum system integrating quantum computation and quantum communication. “The contextuality means there is a context. The former context affects the latter context. We have no context in the classical (normal) world, but the quatum state is special. If somebody else has seen it before, that will affect the result you see now. This is the contextuality. Through the contextuality, we can produce the nonlocality. We are the first to get this finding,” said Li Chuanfeng, member of the team and professor of Key Laboratory of Quantum Information, CAS.


Record set for linked photons

30 November 2016

  • Entangled particles should one day enable quantum computing and communications, but they are inefficient to produce. A team led by Jian-Wei Pan of the University of Science and Technology of China in Hefei created the ten entangled photons by running five photon pairs through a series of four polarizing beam splitters. They also developed a laser light source that produced their photon batches about 100 times faster than did previous tests.


China’s 712-km quantum communication line put into use

November 20, 2016

  • After three years of construction, a 712-km quantum communication line has opened in east China, making it the world’s longest secure quantum telecommunications network in use. The new quantum communication line links Hefei, capital of Anhui Province, to Shanghai. It is part of a 2,000-km quantum communication line connecting Beijing and Shanghai, according to Chen Yu’ao, professor at the University of Science and Technology of China (USTC) in Hefei and chief engineer of the Beijing-Shanghai quantum communication line. The 712-km line has 11 stations, according to Chen.


Chinese Physicists Achieve Record-Breaking Quantum Cryptography Breakthrough

November 4, 2016

  • Researchers at the University of Science and Technology of China and other Chinese labs, with the collaboration of a lab in the US, have implemented a secure quantum protocol known as Measurement-Device-Independent Quantum Key Distribution (MDIQKD), suitable for practical networks and devices, over a distance of 404 km. The breakthrough, which doubles the previous MDIQKD record, opens the door to secure wide area quantum communication networks. The research was published earlier this week (November 2) in Physical Review Letters with the title “Measurement-Device-Independent Quantum Key Distribution Over a 404 km Optical Fiber.” A companion “Synopsis: Quantum Cryptography Goes a Long Way” was published in APS Physics.


China’s 2,000-km Quantum Link Is Almost Complete

26 Oct 2016

  • By the end of this year, a team led by researchers from the University of Science and Technology of China, in Hefei, aims to put the finishing touches on a 2,000-kilometer-long fiber-optic link that will wind its way from Beijing in the north to the coastal city of Shanghai. With these developments, China is poised to vastly extend the reach of quantum key distribution (QKD), an approach for creating shared cryptographic keys—sequences of random bits—that can be used to encrypt and decrypt data. Thanks to the fundamental nature of quantum mechanics, QKD has the distinction of being, in principle, unhackable. A malicious party that attempts to eavesdrop on a quantum transmission won’t be able to do so without creating detectable errors.


Precise quantum cloning: Possible pathway to secure communication

October 26, 2016

  • A global race is on to use quantum physics for ultra-secure encryption over long distances according to Prof Ping Koy Lam, node director of the ARC Centre of Excellence for Quantum Computation and Communication Technology (CQC2T) at ANU. “Our probabilistic cloning method generates higher quality quantum clones than have ever been made before, with a success rate of about 5 percent. We can now create up to five clones of a single quantum state,” said lead author Jing Yan Haw, ANU PhD researcher.


Chinese scientists achieve high-power quantum computing


  • In a recent case, Chinese scientists managed to tremendously enhance such power — they succeeded in performing quantum simulation with atoms in extraordinarily cold conditions. According to Liu, spin-orbit coupling is the key to understanding some most significant discoveries in recent years, such as the topological superconductivity and the Quantum Spin Hall effect, in the development of new energy and new materials. Nonetheless, such simulation requires a computation capacity far beyond that of any conventional computers. So scientists from the University of Science and Technology of China and Peking University proposed and built a two-dimensional spin-orbit coupling system to simulate the process directly, without any computation.


China Leads The Quantum Race While The West Plays Catch Up

Sep 30, 2016

  • Now that China has launched the world’s first quantum communication satellite, the question is will it deliver on its promise. And no one disputes that the outcome of the space-based experiments can advance relative capabilities in cryptography as well as cybersecurity, surveillance and communications, tilting the strategic and military balance in favor of China.


China Says It Has Quantum Radar: What Does That Mean?

September 27, 2016

  • 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.


China’s orbiting quantum satellite links with ground stations

24 September, 2016

  • A quantum channel had been well established between the ­satellite and ground stations, Pan Jianwei, the nation’s leading ­expert in quantum physics, said at a technology exhibition in Hong Kong. China had been exploring the military and commercial applications of quantum technology, and successful tests of the satellite ­system would pave the way for the construction of large quantum communication networks, he said.Pan said his team had successfully passed photons, or particles of light, between the satellite and ground stations in Tibet and Xinjiang province.


Teleportation, the next generation: Chinese and Canadian scientists closer to a quantum internet

19 September, 2016

  • 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 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.


China´s Quantum Satellite Experiments: Strategic and Military Implications

19 Sep 2016

  • While China’s quantum science satellite (QSS) project is part of the Strategic Priority Programme on Space Science, the country’s first space exploration programme intended purely for scientific research, its experiments have significant military implications. The quantum science satellite (QSS) programme is the third mission of the 2011 Strategic Priority Programme on Space Science that includes a series of satellite launches between 2015 and 2030 to explore black holes, dark matter, and cosmic background radiation. Research on quantum technology is also a key priority, including in the 13th Five-Year Plan, China’s latest economic blueprint for research and development released in March 2016. The QSS is sponsored and managed by the China Academy of Sciences (CAS), and led by chief scientist Pan Jianwei. Its mission payload was developed jointly by the CAS’s Shanghai Institute of Technical Physics (SITP) and the University of Science and Technology of China (USTC).


China can now detect stealth aircrafts with its first quantum radar

September 10, 2016

  • After Quantum Satellite, China successfully develops its own stealth spotting quantum radar system After introducing the world’s first hack-free satellite, China has successfully tested its first next-generation quantum radar with an ability to detect objects, including stealth aircraft, within a range of 100 kilometres, according to Chinese state-run Xinhua news agency. The radar is reportedly capable to detecting enemy targets up to 60 miles away and it was successfully tested last month.


China successfully develops quantum radar system

September 08, 2016

  • The quantum radar system was developed by the Intelligent Perception Technology Laboratory of the 14th Institute of CETC. Researchers completed experiments on quantum detection and target scattering characterization. In the target detection experiment, conducted in a real atmospheric environment, the detection ability of the system was proven to be over 100 kilometers.


China’s Quantum Science Satellite to begin experiments


  • China’s Quantum Science Satellite is operating well in orbit after testing and will begin its experiments this month, according to the project’s lead scientist Pan Jianwei. Pan told state media Xinhua that satellite-to-earth links have been established between ‘QUESS’ and five ground stations across China, laying the technical foundation for distributing quantum keys.


‘Handshake’ shows China’s quantum satellite performing even better than expected, says scientist

29 August, 2016

  • The world’s first quantum satellite Micius is doing “very well” in space after its launch earlier this month, with all on-board scientific instruments meeting or exceeding expectations, a senior scientist involved in the project said. Major preparations were completed a couple of days ago, paving the way for ground-breaking experiments in communications and physics, Professor Wang Jianyu told the South China Morning Post.


First data from quantum satellite “Micius” received


  • The first batch of data from the world’s first quantum satellite was received by Chinese scientists, the Chinese Academy of Sciences (CAS) said Thursday. The 202 MB of data was in good quality and was transferred to China’s National Space Science Center.


China launches world’s first quantum science satellite from Jiuquan


  • The Quantum Science Satellite lifted off from the Jiuquan Satellite Launch Centre at 01:40 Beijing time on Tuesday (17:40 UTC Monday), with a Long March 2D rocket sending the 620kg probe into a sun-synchronous orbit 600 km above the Earth. Once operational, the satellite will attempt an unprecedented experiment to see if the spooky property of quantum entanglement can operate at long distance by sending entangled photons from the satellite to two ground stations separated by around 1,200 kilometres.


World’s first quantum communication satellite ‘Micius’


  • The world’s first quantum communication satellite, which China is preparing to launch, has been given the moniker “Micius,” after a fifth century B.C. Chinese scientist, the Chinese Academy of Sciences (CAS) announced Monday. According to CAS, the quantum satellite will conduct experiments on high-speed quantum key distribution between the satellite and ground stations, as well as explore quantum teleportation for the first time in the world.