Australia and New Zealand physicists have teamed up to develop a quantum hard disk prototype that has extended the information storage time by more than 100 times to a record-breaking six hours. This breakthrough is an important step towards building a secure global data encryption network based on quantum information that can be used for banking transactions and personal e-mail. "We believe that the distribution of quantum information between any two points in the world will soon become possible." Zhong Manjin, the main author of the paper and the National Institute of Physics and Engineering at the Australian National University, said, "The quantum state is very fragile, usually It can only last for a few milliseconds and then it will crash. Our long-term storage capacity is expected to bring innovation to the field of quantum information." The difficulty in deciphering quantum security keys created by quantum networks is due to the use of entanglement between particles, such as photons, as information carriers—no matter how far apart they are related when observing the state of a particle. The state of another particle also changes instantaneously. According to a recent report by the Physicist Organization Network, the Australian National University and the University of New Zealand’s Otago University’s research team used rare earth elements embedded in crystals to store information. This kind of solid-state storage technology is very promising and is expected to replace the technology of using lasers in optical fibers. Currently, quantum networks created using the latter have a length of about 100 kilometers. "Now our storage can last for so long, which means that people need to rethink which is the best way to distribute quantum data." Zhong Manjin said, "If given a distance, even if we send us at a walking speed," Crystals, information loss will be less than the laser system." She said: "We can now imagine storing entangled light in different crystals and then transmitting them to different network receiving points thousands of kilometers away. Therefore, we are considering using our crystal as a portable quantum optical hard disk. "" The research team used a laser to write a quantum state into the spin of the helium nuclei, and then placed the crystal in a combination of a fixed magnetic field and an oscillating magnetic field to protect the fragile quantum information. "The two magnetic fields isolated the spin of the helium atoms and prevented the leakage of quantum information," said Jevon Lundell of Otago University. Matthew Silas, head of the Australian National University team and associate professor, said: "Exploring quantum entanglement at such a distance is impossible in the past." Their research was published in the journal Nature. (Chen Dan)
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