Quantum teleportation relies on the phenomenon known as quantumentanglement, in which two particles are entangled with each other and the behavior of one particle will affect the state of the other even at long distances. Einstein once described the phenomenon as "ghost-like" and can be used to transmit information over long distances.
Previous studies have shown that particles can be transmitted instantaneously over the indoor area, even as light has been transmitted across the Danube in Austria. Now, two papers published in the journal Nature Photonics claim that quantum teleportation via urban light is feasible. New research helps create a "quantum Internet" that is faster, more efficient and more secure than today's networks.
Teleportation of quantum sounds like a scene in science fiction, but the use of fiber optic networks for remote quantum teleportation is safer than transmitting through air, requiring only a single source of light, which represents a huge technological challenge. When a light beam passes through a few kilometers of fiber, it needs to remain invisible.
The research conducted by China University of Science and Technology in Hefei and the University of Calgary in Calgary, Canada, have all proved the feasibility of using optical fiber for quantum teleportation. Their experiments mimic the quantum network structure of the future, setting up three different locations, named Alice, Charlie, and Bob.
Frederic Grosshans, a quantum computer expert at the National Science Research Center in Paris, said: "Both experiments have shown that it is technically feasible to implement quantum teleportation within a city. Many interesting quantum information experiments will help create such a network. "
In addition, both experiments will also have an impact on cryptography, helping to transmit information more securely, including between the Earth and spacecraft. For example, if NASA communicates with an astronaut who landed on Mars, no hacker will ever break into an encrypted channel to send false information.
Quantum teleportation can also be used in the financial sector, such as ensuring bank account security over long distances. Michio Kaku, a professor of physics at City University of New York, said the breakthrough could help move people instantly. He called this technology a reality by the turn of the century, and humanity's "teleportation" in the universe was only a matter of time.
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