Researchers have built the most sophisticated quantum computer yet, signaling progress toward a powerful new way of processing information.
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Category: quantum physics
By sending quantum information several kilometers, the researchers took a big step toward the future of information security.
A team of Chinese researchers say they have completed the first long-distance quantum secure direct communication, a critical step toward sending messages that are truly safe from eavesdropping.
The information traveled 2.7 kilometers along a quantum channel, the team said in a paper that was peer-reviewed by China’s Science Bulletin journal and placed online Oct. 22.
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Today’s Sputnik moment is China’s rapid growth as an economic and technological superpower. In 2017 alone, China has outpaced the United States in renewable energy efforts and has become the standard-bearer in combating climate change and advocacy for globalization. Similarly, China is rapidly moving towards taking the lead in technology from the United States and is looking at quantum computing and artificial intelligence as areas for growth to do so.
The Verge recently published an article citing Alphabet chief executive officer Eric Schmidt’s perspective that the United States is falling behind when it comes to research and development in artificial intelligence, particularly compared to the rapid pace of innovation that China has set in the field. Schmidt, who is also the chair of the Defense Innovation Advisory Board, gave those remarks as part of a discussion at The Artificial Intelligence and Global Security Summit held by The Center for a New American Security (CNAS), a nonprofit think tank dedicated to research and analysis on how the United States can make informed policy-making decisions on national security and defense.
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“Room temperature quantum sensors can be mounted directly on the scalp of any subject. This will give us a projected four-fold increase in sensitivity for adults, but the sensitivity could potentially be up to a 15 or 20 fold increase for children or babies.”
A £1.6 million collaborative project between scientists at the University of Nottingham and University College London (UCL) is looking to improve the way we map the human brain. Focusing on the development of magnetoencephalography (MEG), researchers have 3D printed a prototype helmet that may yield quadruple the sensitivity of current MEG devices.
Reading at room temperature
In MEG, sensors capable of detecting the most sensitive magnetic fields emitted by the brain are added close to the scalp. Traditionally, these sensors would require cryogenic cooling (down to – 269 degrees) for operation. Nottingham and UCL’s MEG device uses the newly invented SERF sensors meaning that they can operate at room temperature and be placed directly on the skin.
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Physicists have proposed a way to test quantum gravity that, in principle, could be performed by a laser-based, table-top experiment using currently available technology. Although a theory of quantum gravity would overcome one of the biggest challenges in modern physics by unifying general relativity and quantum mechanics, currently physicists have no way of testing any proposed theories of quantum gravity.
Now a team of seven physicists from various countries, S. Dey, A. Bhat, D. Momeni, M. Faizal, A. F. Ali, T. K. Dey, and A. Rehman, have come up with a novel way to experimentally test quantum gravity using a laser-based experiment. They have published a paper on their proposed test in a recent issue of Nuclear Physics B.
One reason why testing quantum gravity is so challenging is that its effects appear only at very high-energy scales and their corresponding tiny length scales. These extreme scales, which are very near the Planck scale, are roughly 15 orders of magnitude beyond those accessible by the Large Hadron Collider (LHC), by far the world’s highest-energy experiment.
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Quantum physicists in Oriol Romero-Isart’s research group in Innsbruck show in two current publications that, despite Earnshaw’s theorem, nanomagnets can be stably levitated in an external static magnetic field owing to quantum mechanical principles. The quantum angular momentum of electrons, which also causes magnetism, is accountable for this mechanism.
Already in 1842, British mathematician Samuel Earnshaw proved that there is no stable configuration of levitating permanent magnets. If one magnet is levitated above another, the smallest disturbance will cause the system to crash. The magnetic top, a popular toy, circumvents the Earnshaw theorem: When it is disturbed, the gyrating motion of the top causes a system correction and stability is maintained. In collaboration with researchers from the Max Planck Institute for Quantum Optics, Munich, physicists in Oriol Romero-Isart’s research group at the Institute for Theoretical Physics, Innsbruck University, and the Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, have now shown that: In the quantum world, tiny non-gyrating nanoparticles can stably levitate in a magnetic field.
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