At the moment, sensitive data is typically encrypted and then sent across fiber-optic cables and other channels together with the digital “keys” needed to decode the information. However, the data can be vulnerable to hackers.
![](https://3c1703fe8d.site.internapcdn.net/newman/csz/news/tmb/2019/data.jpg)
Source:
https://phys.org/news/2019-06-ultimate-limits-quantum-networks.html