October 18, according to foreign media reports, the relevant NASA-related researchers recently used urban fiber optic cable to achieve long-range quantum transmission, the "dark cable" in the Canadian city of Calgary laser laser photons sent 3.7 miles.
It is reported that the transmission medium used in this experiment is what researchers call "dark cable" fiber. This is the quantum transfer experiment that researchers carried out in a real-world environment out of the lab environment, with a new experimental record of transmission distances over 3.7 miles. It marks a significant step toward building a quantum Internet. By means of quantum transmission, an absolutely secure transmission of the encrypted information can be achieved, which allows the sender of the information to send the "invisible information" to the recipient, and no information can be intercepted on the quantum network.
The results of the study are published in the latest issue of Nature Photonics, a NASA Jet Propulsion Laboratory, University of Calgary, Boulder, Colorado, and the National Institute of Standards and Technology The cooperation project. Researchers use unused "dark fiber" for quantum transmission while detecting photons with a specially designed photon sensor. It is reported that this is the first experimental quantum transmission in an existing urban optical cable and is the first time that a 3.7-km photon transmission is realized in an actual infrastructure. Researchers had previously been able to achieve quantum transmission of this distance only in a lab environment.
Researchers FrancescoMarsili pointed out that "to conduct a series of questions outside the laboratory quantum transmission is a new challenge.To overcome these problems, this experiment is an important milestone for the development of the quantum Internet in the future."
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