Quantum technology

Chinese Satellite Is 1 Giant Step for the Quantum Internet

July 27, 2016

  • China is poised to launch the world’s first satellite designed to do quantum experiments. A fleet of quantum-enabled craft is likely to follow. “Definitely, I think there will be a race,” says Chaoyang Lu, a physicist at the -University of Science and Technology of China in Hefei, who works with the team behind the Chinese satellite. The 600-kilogram craft, the latest in a string of Chinese space-science satellites, will launch from Jiuquan Satellite Launch Center in August. The Chinese Academy of Sciences and the Austrian Academy of Sciences are collaborators on the $100-million mission.


Diamond coupled to carbon nanotube could be used for quantum information processing

July 11, 2016

  • By carefully placing a tiny piece of diamond within a few nanometers of a carbon nanotube, and then sending an electric current through the nanotube, researchers have designed a device that could one day form the building blocks of quantum information processing systems. In their recent study, they have shown that the electrified nanotube’s mechanical vibrations couple to the magnetic (or spin) properties of defects in the diamond. This coupling allows for the quantum states of the nanotube and diamond to be transferred to each other as well as to a second diamond positioned several micrometers away. The researchers, Peng-Bo Li et al., have published a paper on the new hybrid quantum device in a recent issue of Physical Review Letters.


Quantum fingerprinting surpasses classical limit

July 5, 2016

  • Now in a new study, researchers have experimentally demonstrated a quantum fingerprinting protocol and shown that it can surpass the classical limit for solving communication complexity problems. In these problems, two parties each have a message, and they both share some of their message with a referee, who has to decide whether the two messages are the same or not. The classical limit requires that a minimum amount of information must be transmitted between each party and the referee in order for the referee to make this decision. “For the first time, we have demonstrated the quantum advantage over classic information processing in communication complexity,” coauthor Qiang Zhang, a physicist at the University of Science and Technology of China and the Jinan Institute of Quantum Technology, told Phys.org.


China to launch ‘hack-proof’ quantum satellite next month

05 July, 2016

  • China will launch the world’s first quantum satellite next month to demonstrate a series of advanced technologies such as hacker-proof communications and quantum teleportation. Ground testing and quality checks on the satellite had finished at the Chinese Academy of Sciences, and it would depart for the Jiuquan Satellite Launch Centre in Inner Mongolia early this month for a launch aboard a Long March 2D rocket in the middle of next month, according to a report on the central government’s website posted on ­Friday.


Quantum Cryptographers Set 400K Distance Record

June 28, 2016

  • Quantum cryptography is a method of transmitting information from one point in space to another so that it cannot leak out along the way. It is provably, perfectly secure, guaranteed by the laws of physics. In effect, it is the universe’s way of keeping secrets. Today that changes thanks to the work of Hua-Lei Yin at the University of Science and Technology of China in Hefei, and a few pals who unveil a record-breaking demonstration of a form of device-independent quantum cryptography for the first time. Hua-Lei and co have sent a key over a distance of more than 100 kilometeres at data rates measured in kilobits per second, and they have even managed distances of over 400 kilometers at lower data rates. “This is by far the longest distance reported for all kinds of quantum key distribution systems,” say the team.


First Demonstration of 10-Photon Quantum Entanglement Sets New Record

June 9, 2016

  • Entanglement is the strange phenomenon in which quantum particles become so deeply linked that they share the same existence. Once rare, entangling particles has become routine in labs all over the world. Which is why the work of Xi-Lin Wang and pals at the University of Science and Technology of China in Heifu is impressive. Today, they announce that they’ve produced 10-photon entanglement for the first time, and they’ve done it at a count rate that is three orders of magnitude higher than anything possible until now.


New Quantum ‘Cat State’ Can Be in Two Places at Once


  • The Yale physicists have added a new twist: not only are the photons in a superposition of states, they are also entangled, meaning that changing the state of one will change the state of the other, even if they are separated. It’s one of the strangest aspects of quantum mechanics. Albert Einstein dubbed it “spooky action at a distance.” To create the state, they built a small chamber with two separate cavities made of aluminum. The microwave photons bounced around inside the cavities, and the team managed to connect them with a sapphire superconducting artificial atom. The result: two alive-and-dead cats made of microwave light in two different cat boxes at the same time. Chen Wang1,, Yvonne Y. Gao1, Philip Reinhold1, R. W. Heeres1, Nissim Ofek1, Kevin Chou1, Christopher Axline1, Matthew Reagor1, Jacob Blumoff1, K. M. Sliwa1, L. Frunzio1, S. M. Girvin1, Liang Jiang1, M. Mirrahimi1,2, M. H. Devoret1, R. J. Schoelkopf1, http://science.sciencemag.org/content/352/6289/1087


EU and China prepare for 2nd quantum revolution


  • The European Union, United States, China, Japan are preparing for the so-called 2nd quantum revolution. The EU plans to invest 1 billion Euros in research for the next 10 years, starting in 2018. A broad community of industries, research institutes and scientists aim for Europe to stand at the forefront of bringing transformative advances to science, industry and society, by creating new commercial opportunities to address global challenges that provide strategic capabilities for security and seeds as yet un-imagined capabilities for the future.


China to launch world’s first quantum satellite in July


  • The world’s first satellite that can achieve quantum communication between the space and the Earth will be launched in July, a leading expert in the field said on May 21, the news website ThePaper.cn reported. Pan Jianwei, a quantum expert and an academician of the Chinese Academy of Sciences, revealed the news at a seminar held in Shanghai. The satellite is dedicated to quantum science experiments, and it will serve as evidence that China is leading the world to achieve satellite-earth quantum communication, Pan said.


Quantum computing closer as researchers drive towards first quantum data bus

April 18, 2016

  • The research team from the Quantum Photonics Laboratory at RMIT in Melbourne, Australia, the Institute for Photonics and Nanotechnologies of the CNR in Italy and the South University of Science and Technology of China, have demonstrated for the first time the perfect state transfer of an entangled quantum bit (qubit) on an integrated photonic device.


Chinese tech set to take quantum leap

March 26, 2016

  • CHINA is set to lead the development of quantum science globally when the world’s first quantum satellite and a 1,000-kilometer quantum communication line connecting Shanghai and Beijing start operating in the second half of the year, a Shanghai-based national quantum research center said yesterday. “The satellite will blast off in the second half — the first quantum communications satellite in the world,” Pan Jianwei, the director of the center in Zhangjiang High-Tech Park in Shanghai, said yesterday.


Optical Quantum Technology Breakthrough to Improve Cyber Security


  • The collaboration involving physicists at the Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), an ARC Centre of Excellence headquartered in the School of Physics, and electrical engineers from the School of Electrical and Information Engineering, has been published in Nature Communications. The team’s work resolved a key issue holding back the development of password exchange which can only be broken by violating the laws of physics. Photons are generated in a pair, and detecting one indicates the existence of the other. This allows scientists to manage the timing of photon events so that they always arrive at the time they are expected. Lead author Dr. Chunle Xiong, from the School of Physics, said: “Quantum communication and computing are the next generation technologies poised to change the world.”


Two defining features of quantum mechanics never appear together

March 21, 2016

  • Two of the most important ideas that distinguish the quantum world from the classical one are nonlocality and contextuality. Previously, physicists have theoretically shown that both of these phenomena cannot simultaneously exist in a quantum system, as they are both just different manifestations of a more fundamental concept, the assumption of realism. Now in a new paper, physicists have for the first time experimentally confirmed that these two defining features of quantum mechanics never appear together. The physicists, Xiang Zhan, et al., have published a paper on the nonlocality-contextuality tradeoff in a recent issue of Physical Review Letters.


New chip paves the way for optical quantum technology in laptops and smartphones

March 15, 2016

  • According to the researchers, the chip meets numerous criteria for its ready incorporation into existing technologies such as quantum information processing, imaging, and microscopy. This, they say, is because it is compact, cheap to make, scalable, compatible with ordinary electronic components, and it uses standard telecommunication frequencies. The combined effort of the City University of Hong Kong, the University of Sussex and Herriot Wat University in the UK, Yale University, the Xi’an Institute in China, and the INRS in Montreal, Canada, this ground-breaking research is the result of a decade of collaborative research on complementary metal–oxide–semiconductor (CMOS) compatible chips for nonlinear optics in classical and quantum physics.


Chinese scientists realize quantum simulation of the Unruh effect


  • The researchers, led by Prof. Jiangfeng Du from University of Science and Technology of China, reported an experimental simulation of the Unruh effect with an NMR quantum simulator [5]. The experiments were performed on a Bruker Avance III 400MHz spectrometer. The researchers used a sample of 13C, 1H and 19F nuclear spins in chloroform as the NMR quantum simulator, as shown in Figure 1(a). The simulated Unruh effect on the quantum states can be realized by the pulse sequence acting on the sample, as depicted in Figure 1(b). By the quantum simulator, they experimentally demonstrated the behavior of Unruh temperature with acceleration, which agrees nicely with the theoretical prediction, as shown in Figure 2. Furthermore, they investigated the quantum correlations quantified by quantum discord between two fermionic modes as seen by two relatively accelerated observers. It is shown for the first time that the quantum correlations can be created by the Unruh effect from the classically correlated states. This work was recently published in the Science China-Physics, Mechanics & Astronomy.


China Makes Techonological Breakthrough With Quantum Space Satellite

Mar 08, 2016

  • Quantum space satellite, a satellite under the Chinese space program, is making waves in the country as it is the first satellite to deliver quantum communication in China, according to Chinese state media. The satellite is designed to provide ‘untraceable’ communication by converting messages into a quantum language before sending them to space.


China’s Quantum Satellite Could Change Cryptography Forever

March 3, 2016

  • The Quantum Space Satellite, aka Quantum Experiments at Space Scale (QUESS), will seek to turn this theory into reality. It will be launched in July 2016. Chief scientist Pan Jianwei remarks that QUESS will complete China’s growing quantum communications network, which includes a 2,000-kilometer-long network between Beijing and Shanghai. QUESS’s function is to test the phenomena of quantum entanglement. Operated by the China Academy of Sciences, this 500kg satellite contains a quantum key communicator, quantum entanglement emitter, entanglement source, processing unit, and a laser communicator. QUESS will relay transmissions between two ground stations (one in China, and the other in Europe) transmitting quantum keys. Pan remarked that the distances involved (the QUESS orbits at an altitude of 1,000km) is ideal for testing quantum teleportation of photons. Additionally, the Austrian Academy of Sciences will provide the optical receivers for the European ground stations.


Physicists propose the first scheme to teleport the memory of an organism


  • In a recent study, Tongcang Li and Zhang-qi Yin propose to put a bacterium on top of an electromechanical membrane oscillator integrated with a superconducting circuit to prepare quantum superposition state of a microorganism and teleport its quantum state. A microorganism with a mass much smaller than the mass of the electromechanical membrane will not significantly affect the quality factor of the membrane and can be cooled to the quantum ground state together with the membrane. Quantum superposition and teleportation of its center-of-mass motion state can be realized with the help of superconducting microwave circuits. With a strong magnetic field gradient, the internal states of a microorganism, such as the electron spin of a glycine radical, can be entangled with its center-of-mass motion and be teleported to a remote microorganism. Since internal states of an organism contain information, this proposal provides a scheme for teleporting information or memories between two remote organisms.


China’s quantum space pioneer: We need to explore the unknown

14 January 2016

  • Physicist Pan Jian-Wei is the architect of the world’s first attempt to set up a quantum communications link between Earth and space — an experiment that is set to begin with the launch of a satellite in June. The satellite will test whether the quantum property of entanglement extends over record-breaking distances of more than 1,000 kilometres, by beaming individual entangled photons between space and various ground stations on Earth. It will also test whether it is possible, using entangled photons, to teleport information securely between Earth and space.


Quantum teleportation breakthrough earns Pan Jianwei’s team China’s top science award

08 January, 2016

  • A breakthrough in quantum technology has earned China’s top science accolade as President Xi Jinping handed the State Natural Science Award (first class) to a team of quantum physicists led by Pan Jianwei in Beijing on Friday. Pan’s team at the University of Science and Technology of China in Hefei, Anhui province, set a world record in terms of quantum teleportation, or the sending of quantum information – for example, the exact state of an atom – from one place to another.


China set for quantum leaps in spook-proof communications

19 December, 2015

  • China is on track to launch the world’s biggest spook-proof quantum communications system in the next six months, one that could eventually cover Hong Kong, a leading Chinese scientist said on Friday. Beijing will send the world’s first quantum communications satellite into space in June – around the same time as it aims to put the world’s longest quantum communications network into service, according to Pan Jianwei, the projects’ chief scientist.


Diamonds are for error: Chinese team clear ‘error’ hurdle to pave way for quantum computer that could make geniuses of us all

09 December, 2015

  • Chinese scientists have built the world’s first fault-tolerant quantum computer in a piece of diamond and it will eventually be able to find – in the blink of an eye – passwords and other encrypted information that regular computers need years or decades to uncover, they said. As such, the breakthrough, coupled with other technological advances over the last few years by companies such as IBM, led the team to make a bold and unsettling prediction: The nation’s first quantum computer should be ready for commercial use within a decade.


Scientists design a QKD-based quantum private query with no failure

November 25th, 2015

  • In an article connected with College of Computer Science, Chongqing University, in the Chinese city of Chongqing, they revealed in the study, which was published in Science China-Physics, Mechanics & Astronomy, that it is the randomness in the dilution of the oblivious key, one of the main processes in such protocols, that caused the possible failure of previous QKD-based QPQ. And utilizing the features of DPS, their protocol successfully avoids the process of dilution. Without the process of dilution, this new protocol becomes more reliable and reasonable, compared with the previous QKD-based QPQ protocols. Just as the scholars stated in their article: “Different from the situations in the previous QKD-based QPQ protocols, in our protocol, the number of the items an honest user will obtain is always one and the failure probability is always zero.”


AVIC signs quantum technology deal with Chinese science university

16 November 2015

  • The Aviation Industry Corporation of China (AVIC) and the University of Science and Technology of China (USTC) have agreed to jointly develop quantum technologies for aerospace applications, AVIC has announced. Under a framework accord signed on 13 November, the two state-owned entities will develop, over the next few years, a quantum technology research and development centre in Hefei, eastern China. AVIC said this facility would be dedicated to developing quantum technologies for aerospace and related activities, accelerating training and technical understanding of quantum technologies, and to exploring new applications using those technologies.


Alibaba, Chinese academy team on quantum cryptography

October 15, 2015

  • The Alibaba Group and the government-affiliated Chinese Academy of Sciences said Wednesday they will work together on research and development of practical applications of quantum cryptography for secure data transmission. The academy and Alibaba’s cloud computing subsidiary, Aliyun, co-founded a quantum computing laboratory in Shanghai in July. With Wednesday’s announcement, the partners have embarked on R&D and plan to start large-scale verification experiments by the end of the year.


Physicists Get An Atom To Act Like It’s In Another Universe

9 October 2015

  • Quantum physicists in China and Spain have uprooted some of the central assumptions about how atoms behave on a quantum level. The team, led by Professor Enrique Solano, were able to provoke atoms to act in ways that were against their own fundamental laws, the same way we think of time travel or hovering in the air as against our own physical laws. Solano aptly compares it to science fiction, or actors in a play.


New way of retaining quantum memories stored in light: Chinese scientists uncover a novel way of stopping light in a state that stores information encoded in photons, opening the door to applications in quantum information processing

October 1st, 2015

  • A team of Chinese physicists has now developed a way to confine light. This is significant because the approach allows quantum memories stored within photons to be retained. These findings stem from a study by Nan Sun from Nanjing University of Posts & Telecommunications, China, and colleagues, which has just been published in EPJ D. The results may herald the advent of a multitude of hybrid, optoelectronic devices relying on the use of quantum information stored in photons for processing information that can be used in communication networks or quantum computing.


Alibaba Places Bet on Quantum Computing, Pledges to Invest 30 Million Yuan Annually

Sep 05, 2015

  • To create a quantum computer that processes data at tremendous speeds–trillions of times quicker than the world’s fastest computer, China’s supercomputer Tianhe-2–is the target of a prospective game-changing scheme introduced by Alibaba Group Holding Ltd. and the Chinese Academy of Sciences (CAS). If the venture becomes successful, the effect of having a China-based lightning-speed computer could make all modern technological developments worldwide during the past 50 years look like baby steps.


Quantum computer that ‘computes without running’ sets efficiency record

August 31, 2015

  • Now in a new paper, scientists have experimentally demonstrated a slightly different version called a “generalized CFC” that has an efficiency of 85% with the potential to reach 100%. This improvement opens the doors to realizing a much greater variety of applications, such as low-light medical X-rays and the imaging of delicate biological cells and proteins—in certain cases, using only a single photon. The researchers, led by Prof. Jiangfeng Du at the University of Science and Technology of China and Prof. Liang Jiang at Yale University in the US, have published a paper on the high-efficiency counterfactual computing method in a recent issue of Physical Review Letters.


Quantum revolution: China set to launch ‘hack proof’ quantum communications network

August 30, 2015

  • China is set to complete the installation of the world’s longest quantum communication network stretching 2,000km (1,240miles) from Beijing to Shanghai by 2016, say scientists leading the project. Quantum communications technology is considered to be “unhackable” and allows data to be transferred at the speed of light. By 2030, the Chinese network would be extended worldwide, the South China Morning Post reported. It would make the country the first major power to publish a detailed schedule to put the technology into extensive, large-scale use.


Artificial Intelligence & Quantum Computing: Utopia or Dystopia?

16th June 2015

  • A key challenge is that machine learning with the rapidly growing “big data problem” could become intractable for classical computers to handle leaving the field wide open for Quantum computers that can handle vast numbers of samples with relatively few Quantum bits or Qbits. Recently, quantum machine learning algorithms were proposed which could offer an exponential speedup over classical algorithms. The Chinese have now demonstrated some of these algorithms to be workable and true. Zhaokai Li et al at the University of Science and Technology of China in Hefei have demonstrated machine learning on a Quantum Computer for the first time. Their Quantum Computer can recognise handwritten characters, just as humans can do, in what Li et al are calling the first demonstration of “Quantum artificial Intelligence”. Chao-Yang Lu et al at the University of Science and Technology of China in Hefei, have also demonstrated a quantum entanglement-based machine learning method called quantum-based vector classification. This quantum-based vector classification method can be used for both supervised and unsupervised machine learning, and so could have a wide variety of applications. It’s also ubiquitous in our daily lives, such as in face recognition, email filtering, and recommendation systems for online shopping.


World’s Fastest Quantum Random Number Generator Unveiled in China

June 11, 2015

  • Quantum cryptography can only become successful if somebody can generate quantum random numbers at the rate of tens of billions per second. Now Chinese physicists say they’ve done it. Today, that looks to have changed thanks to the work of You-Qi Nie at the Hefei National Laboratory for Physical Sciences in China and a few pals who say they have built a quantum random number generator capable of producing 68 billion of them per second. They say the technique should remove an important barrier preventing governments, the military, and the rest of us from benefiting from perfect security.


New research explores when quantum systems get critical

May 15, 2015

  • An international team of scientists from China and Australia have released research that has probed how quantum matter changes when it makes a ‘quantum phase transition’. The collaborators, Professor Haohua Wang’s group in Zhejiang University, China, Professor Jason Twamley at the Centre for Engineered Quantum Systems, Macquarie University, and Professor Mang Feng’s group for Bound-System Quantum Information Processing at Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, have published their latest research result experimentally exploring a quantum phase transition.

Read more at: http://phys.org/news/2015-05-explores-quantum-critical.html#jCp


Chasing ghost images: Chinese scientists report breakthrough in a quantum camera for satellite use

12 May, 2015

  • Mainland scientists have achieved a significant breakthrough which could help them build the first quantum camera for satellites within five years. In a paper in the latest issue of the Scientific Reports journal, professor Gong Wenlin and Han Shensheng detailed a revolutionary method to achieve high-resolution far-field imaging with a quantum camera, which could help snap images an ordinary lens cannot see, such as objects obscured by clouds or smoke. This is commonly dubbed “ghost imaging”. “We have overcome a major hurdle for the quantum camera’s application. Ghost-imaging long distance object is not a dream anymore,” said Gong, quantum optics researcher with the Chinese Academy of Sciences’ Shanghai Institute of Optics and Fine Mechanics.


‘Unhackable’ quantum broadband step closer after breakthrough by Chinese scientists

09 April, 2015

  • Scientists at the University of Science and Technology in Hefei, Anhui province, have demonstrated for the first time that quantum information can be stored and distributed using a broadband communication protocol. Writing in the British journal Nature Photonics the researchers said the technology showed “great promise for the establishment of quantum networks in high-speed communications”. Unlike traditional communication methods, quantum broadband would be immune to hacking, the researchers said.


Quantum computers could greatly accelerate machine learning

Mar 30, 2015

  • (Phys.org)—For the first time, physicists have performed machine learning on a photonic quantum computer, demonstrating that quantum computers may be able to exponentially speed up the rate at which certain machine learning tasks are performed—in some cases, reducing the time from hundreds of thousands of years to mere seconds. The new method takes advantage of quantum entanglement, in which two or more objects are so strongly related that paradoxical effects often arise since a measurement on one object instantaneously affects the other. Here, quantum entanglement provides a very fast way to classify vectors into one of two categories, a task that is at the core of machine learning. The physicists, Chao-Yang Lu, Nai-Le Liu, Li Li and colleagues at the University of Science and Technology of China in Hefei, have published a paper on the entanglement-based machine learning method in a recent issue of Physical Review Letters.


Two quantum properties teleported together for first time

Feb 27, 2015

  • Teleporting more than one state simultaneously is essential to fully describe a quantum particle and achieving this would be a tentative step towards teleporting something larger than a quantum particle, which could be very useful in the exchange of quantum information. Now, Chaoyang Lu and Jian-Wei Pan, along with colleagues at the University of Science and Technology of China in Hefei, have taken the first step in simultaneously teleporting multiple properties of a single photon.


In China, Quantum Communications Comes of Age


  • At a recent conference on quantum science in Shanghai, Wang said scientists from CAS and other institutions have completed major research and development tasks for launching the satellite equipped with quantum communications gear.
  • The satellite would be used to transmit encoded data through a method called quantum key distribution (QKD), which relies on cryptographic keys transmitted via light-pulse signals. QKD is said to be nearly impossible to hack, since any attempted eavesdropping would change the quantum states and thus could be quickly detected by data flow monitors.


Quantum communication advances in China


  • China will soon complete a quantum communication line linking Beijing and Shanghai, as the country leads the way in technology that will offer a more secure delivery of information, the Chinese-language New Century magazine reports.
  • Pan’s team then designed a pilot quantum communication network in Hefei, Anhui province, where his university is located. The network at that time cost 60 million yuan (US$9.9 million) and was completed in February 2012 after 18 months of construction.


Quantum leap forward: China to launch world’s longest, ‘hack-proof’ network by 2016

November 09, 2014

  • China is completing the project of the planet’s longest, 2,000-kilometer quantum communication network from Beijing to Shanghai. The network is considered “unhackable” and is set to start operating in 2016.
  • “China’s quantum information science and technology is developing very fast and China leads in some areas in this field. Any city in China, as long they want to, can start to build the quantum communication network now,” he said, Xinhua reported.


China to build global quantum communication network in 2030


  • HEFEI, Nov. 2 (Xinhua) — China will build a global quantum communication network by 2030, said a leading Chinese quantum physicist on Sunday. “China’s quantum information science and technology is developing very fast and China leads in some areas in this field,” said Pan Jianwei, a Chinese quantum scientist and professor at the University of Science and Technology of China.
  • China will achieve Asia-Europe intercontinental quantum key distribution in 2020 and build a global quantum communication network in 2030, said Pan at the 2014 International Conference on Quantum Communication, Measurement and Computing,which opened Sunday in east China’s Hefei city.


Quantum Computer Performs Artificial Intelligence Task

Oct, 16, 2014

  • In a landmark study, researchers at the University of Science and Technology of China in Hefei have demonstrated artificial intelligence on a quantum computer, reported the blog The Physics arXiv. The computer scientists used machine learning, a process where an algorithm learns from existing sets of data, to train the computer. The researchers trained the computer to recognize the difference between a handwritten 6 and a handwritten 9.


Quantum test strengthens support for EPR steering

Oct 14, 2014

  • In a new study published in Physical Review Letters, a team of physicists led by Professors Jin-Shi Xu and Chuan-Feng Li at the University of Science and Technology of China in Hefei; along with Jing-Ling Chen at Nankai University in Tianjin, China, and the National University of Singapore, have experimentally demonstrated EPR steering using a new method that requires fewer measurements and provides a stronger validation of steering.


China takes quantum information science very serious

August 18, 2014

  • The Center for Micro- and Nanoscal Research and Fabrication (NANO-USTC) at the University of Science & Technology of China (USTC) recently bought another plasma etching and deposition system that they are said to use for fundamental research and development in the field of quantum computing. Earlier this year the Institute for Interdisciplinary Information Sciences (IIIS) at Tsinghua University also bought similar machines also for quantum computing research.


The Space-Based Quantum Cryptography Race

June 27, 2014

  • So it’s not surprising that governments all over the world are keen on exploiting space-based quantum cryptography. Indeed, last year we reported on a Chinese team that had successfully reflected individual photons off an orbiting satellite, to simulate a satellite sending photons to the ground.
  • The Chinese team said the demonstration was a crucial step toward space-based quantum cryptography. However, the ability to send single photons from orbit and receive them on the ground is not enough.
  • Last year, the Chinese announced plans to launch a spacecraft in 2016, called the Chinese Quantum Science Satellite. specifically designed to test these concepts. And European scientists have proposed a quantum communications experiment that could be sent to the international space station.


Quantum hacking on quantum key distribution using homodyne detection

5 March 2014

  • Imperfect devices in commercial quantum key distribution systems open security loopholes that an eavesdropper may exploit. An example of one such imperfection is the wavelength-dependent coupling ratio of the fiber beam splitter. Utilizing this loophole, the eavesdropper can vary the transmittances of the fiber beam splitter at the receiver’s side by inserting lights with wavelengths different from what is normally used. Here, we propose a wavelength attack on a practical continuous-variable quantum key distribution system using homodyne detection. By inserting light pulses at different wavelengths, this attack allows the eavesdropper to bias the shot-noise estimation even if it is done in real time. Based on experimental data, we discuss the feasibility of this attack and suggest a prevention scheme by improving the previously proposed countermeasures.


Quantum Cryptography: OFC 2014’s Workshop on Quantum Security: The cat’s alive!

March 9-14, 2014

  • Bruce Nyman of TE SubCom (Newington, NH), Ribordy, and Qiang Zhang of the University of Science and Technology of China (Hefei, China) provided an overview of QKD carrier-grade networks in fiber, free-space, and on the usage of trusted relay nodes. Zhang provided an update on China’s QKD networks, including a rollout of a metropolitan QKD network with 50 nodes and 90 users in Jinan for multimedia applications (see figure). By the end of 2016, this “quantum backbone” will encompass 2000 km with trusted relay nodes and link QKD metro-nets between Beijing and Shanghai for commercial traffic from banks and news agencies.


China in race to build first code-breaking quantum supercomputer

10 January, 2014

  • Quantum computers have so far existed mainly in the world of science fiction and research laboratories. But they hit the headlines recently after it was reported that the US National Security Agency had been building “a cryptologically useful quantum computer [in] room-sized metal boxes”, according to documents leaked by Edward Snowden to The Washington Post.
  • China is working on an ambitious project of its own and has built a new facility in Hefei , Anhui , in which to do it.


Quantum communications leap out of the lab

23 April 2014

  • This week, China will start installing the world’s longest quantum-communications network, which includes a 2,000-kilometre link between Beijing and Shanghai. And a study jointly announced this week by the companies Toshiba, BT and ADVA, with the UK National Physical Laboratory in Teddington, reports “encouraging” results from a network field trial, suggesting that quantum communications could be feasible on existing fibre-optic infrastructure.
  • The Chinese network “will not only provide the highest level of protection for government and financial data, but provide a test bed for quantum theories and new technologies”, says Jian-Wei Pan, a quantum physicist at the University of Science and Technology of China in Hefei, who is leading the Chinese project.


China’s top quantum tech center founded in Hefei


  • The CAS Center for Excellence Quantum Information and Quantum Physics was founded in Hefei, Anhui province, on Wednesday. The center, based in the University of Science and Technology of China and under the leadership of the Chinese Academy of Sciences, will be built into a top-notch academic institution with an international influence in quantum information and quantum physics, Bai Chunli, president of CAS, said at the founding ceremony.


First Experimental Proof For Super-Fast Quantum Algorithm Published

Jun 09, 2013

  • To implement this algorithm, Xindong Cai, at the University of Science and Technology of China in Hefei, and colleagues used a laser to prepare two pairs of entangled photons, which they spatially separated and sent down four different paths. Passing the photons through a series of logic gates effectively corresponded to the steps of solving two linear equations: inverting a 2×2 matrix, multiplying it through, and calculating the two independent variables. The quantum computer is overkill for solving only two linear equations; the real advantages would come as the number of equations grows. — Jessica Thomas


Scientists Create “Mysterious Quasiparticle” Needed for Quantum Computing in Arcane Lab

Sep 20, 2013

  • Reliable quantum computing would make it possible to solve certain types of extremely complex technological problems millions of times faster than today’s most powerful supercomputers. Other types of problems that quantum computing could tackle would not even be feasible with today’s fastest machines. The key word is “reliable.” If the enormous potential of quantum computing is to be fully realized, scientists must learn to create “fault-tolerant” quantum computers. A small but important step toward this goal has been achieved by an international collaboration of researchers from China’s Tsinghua University and the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) working at the Advanced Light Source (ALS).


Quantum communications system was used at Party Congress in Beijing

21 June, 2013

  • Beijing was so worried about cyberspies during last autumn’s party congress that it turned to a secret, state-of-the-art telecommunications network to handle sensitive information. Use of the next-generation quantum encryption technology at the once-in-a-decade leadership transition was revealed in a passing remark reported last week in People’s Daily.


China Reveals First Space-Based Quantum Communications Experiment

June 10, 2013

  • The “Chinese Quantum Science Satellite” will launch in 2016 and aim to make China the first space-faring nation with quantum communication capability
  • Today, the Chinese claim another small victory in this quantum space race. Jian-Wei Pan at the University of Science and Technology of China in Shanghai and a few pals say they’ve bounced single photons off an orbiting satellite and detected them back on Earth. That’s significant because it simulates a satellite sending single photons from orbit to the surface, crossing off another proof-of-principle milestone in their quantum checklist.


First Quantum Memory That Records The Shape of a Single Photon Unveiled in China

May 15, 2013

  • Today, Dong-Sheng Ding and pals at the University of Science and Technology of China in Hefei say they’ve cracked this problem for the first time. These guys have generated a single photon with a complex spatial structure, stored that photon in a cloud of rubidium atoms and then released it up to 400 nanoseconds later. In their experiment, they compare the structure of the photons that come out of storage with the structure of the photons that go in and say they are more or less identical. “The spatial structure of the photon is preserved very well,” they say. That’s a potentially important advance. Other groups have made similar attempts to store photons in this way but only by using laser beams so weak that they probably contain a single photon at any instant. However, there’s no way of being certain that the experiments definitely do involve single photons.


Chinese physicists create first single-photon quantum memory, leading to quantum internet

May 15, 2013

  • A lab in China is reporting that it has constructed the first memory device that uses single photons to store quantum data. This is a significant breakthrough that takes us further down the path towards a quantum internet, and potentially quantum computing as well. As it currently stands, we already make extensive use of photons — the bulk of the internet and telecommunications backbone consists of photons traveling down fiber optic cables. Rather than single photons, though, these signals consist of carrier light waves of millions of photons, with the wave being modulated by binary data. These pulses are never stored, either; when they reach a router, they’re converted into electrical signals, and then stored in RAM before being converted back into light.


Chinese Physicists Measure Speed of “Spooky Action At a Distance”

March 7, 2013

  • Einstein railed against the possibility of spooky action at a distance because it violates relativity. Now Chinese physicists have clocked it travelling more than four orders of magnitude faster than light
  • Juan and co have perfected this technique by sending photons through the atmosphere from a fish farm near Qinghai Lake in the Tibetan Plateau. (We looked at their work last year when the same team smashed the distance record for teleporting photons using similar gear.) They say the results are clear but do not measure the speed of spooky action directly. Instead, the results place a lower bound on how fast it must be. The answer is that it is at least four orders of magnitude faster than light, and may still turn out to be instantaneous, as quantum mechanics predicts.


China makes breakthrough on quantum computer

February 07, 2013

  • The solid-state quantum research crew from the University of Science and Technology of China succeeded in performing the quantum logic gate operation on one single electron at 10 picoseconds, renewing the previous world records by nearly 100 times, making a big step toward the semiconductor-based “quantum computer”. It is inferable from the Moore’s Law that around 2020, each transistor might be as small as an electron, also known as single-electron transistor. According to Guo Guoping, director of the research project, the information representation with “0” and “1” in the computer information processing is achieved by switch closure. Once the tunneling occurs as the transistor becomes increasingly smaller, the electron will go directly through the transistor and be uncontrollable by the switch closure.


Chinese Physicists Smash Distance Record For Teleportation

May 11, 2012

  • However, physicists have had more success teleporting photons through the atmosphere. In 2010, a Chinese team announced that it had teleported single photons over a distance of 16 kilometres. Handy but not exactly Earth-shattering. Now the same team says it has smashed this record. Juan Yin at the University of Science and Technology of China in Shanghai, and a bunch of mates say they have teleported entangled photons over a distance of 97 kilometres across a lake in China. That’s an impressive feat for several reasons. The trick these guys have perfected is to find a way to use a 1.3 Watt laser and some fancy optics to beam the light and receive it.


China’s Great (Quantum) Leap Forward

Sept. 09, 2010

  • Thanks to a recent technological breakthrough, that’s true literally, too. While China has been showing off its new hardware, a potentially more important military advancement has gone largely unnoticed: In May, Chinese scientists announced a demonstration of “quantum teleportation” over 16 kilometers (10 miles), creating what Matthew Luce, a researcher at the Defense Group Inc.’s Center for Intelligence Research and Analysis, calls “secure communications guaranteed by the laws of physics.” China is now at the cutting-edge of military communications, transforming the field of cryptography and spotlighting a growing communications arms race. While the People’s Liberation Army won’t be beaming up objects Star Trek-style anytime soon, the new technology could greatly enhance its command and control capabilities. Scientists use machines to manipulate units of light called photons. By changing the photons’ quantum states and creating a new, readable pattern not unlike Morse code, they can pass on simple messages or encryption codes. A group of researchers from Tsinghua University and the Hefei National Laboratory for Physical Sciences entangled pairs of photons — linking them so changes to one photon will be instantaneously transferred to the other. Using a high-powered blue laser (the type China appears to be investing in for its submarine fleet), they then transported the quantum information farther than anyone had done before, their paper in Nature Photonics claims.


Chinese develop state-of-the-art quantum cryptography network

Posted: April 5, 2007

  • (Nanowerk News) China’s first computer network in which communications are secured with quantum cryptography has been successfully tested in Beijing. This was announced at the press conference held by the University of Science and Technology of China (USTC) on 2 April in Beijing. Using “quantum routers” they have developed independently, a research team led by Prof. Guo Guang-can from the CAS Key Laboratory of Quantum Information at USTC has been successful in running secure data transmission among four users guaranteed by quantum cryptography on a commercial network operated by Beijing Branch of China Netcom Group.