https://www.sciencedaily.com/releases/2021/10/211021175121.htm

But even that may have a weakness: Encrypted information could be decoded by future quantum computers that would try many keys simultaneously and rapidly find the right one.

To prepare for this future possibility, researchers are working to develop codes that cannot be broken by quantum computers. These codes rely on distributing single photons -- single particles of light -- that share a quantum character solely among the parties that wish to communicate. The new quantum codes require these photons to have the same color, so they are impossible to distinguish from each other, and the resulting devices, networks, and systems form the backbone of a future "quantum internet."