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According to Science Daily, recently scientists have developed a quantum hard disk prototype that can increase storage time by 100 times. The six-hour storage time recorded by the research team is a major step toward secure global data encryption networks based on quantum information, which can be used for banking transactions and personal mail.
"We believe that quantum information can be distributed between any two points in the world very soon," said research lead author Manjin Zhong of the Australian National University of South Australia (ANU) Institute of Physics and Engineering (RSPE). "The quantum state is very fragile and generally flips in milliseconds. The longer storage time we achieve has the potential to revolutionize quantum information transmission."
Quantum information contains the potential for unbreakable encryption because quantum particles, such as photons, can be generated in a specific way to achieve intrinsic connectivity. The interaction between each pair of entangled particles affects each other, no matter how far apart they are.
A team of physicists at the Australian National University and the University of Otago, New Zealand, store quantum information in rare earth element helium atoms inside crystals. Their solid-state technology can be used as a very promising alternative to the use of laser methods in fiber optics, which are now being used to create quantum networks that are about 100 kilometers long.
"We (implement) have a very long storage time, which means that people need to rethink the best way to distribute quantum data," Zhong said. “Even if we transmit our crystals at a pedestrian speed, our methods lose less than a laser system at a specific distance. We can now imagine storing the entangled light in separate crystals and then transporting them into the network. A few thousand kilometers apart in different parts. That is, we use these crystals as portable optical hard disks for quantum entanglement."
After using the laser to write the quantum state on the deuteron spin, the team placed the crystal in a combination of fixed and oscillating magnetic fields to preserve the fragile quantum information. "These two fields isolate the spin of the helium, thus preventing the leakage of quantum information," said Dr. Jevon Longdell of Otago University. The Australian National University’s research team is very excited about the basic tests of quantum mechanics that quantum optical disks can achieve. “We have never had the opportunity to explore such long-distance quantum entanglement,†said Matthew Sellars, research group leader and assistant professor. "We should always try to test whether the theory is consistent with reality. Perhaps in this new system, our quantum mechanics theory will also have unexpected problems."
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