There are already some quantum resistant encryption techniques, and if we use quantum mechanics itself to perform encryption we then have something provably unbreakable. It's just a question of whether quantum error correction is a solvable problem:
If yes, all our old encryption techniques should be considered broken and will become immediately redundant, but in return we get 100% secure encryption.
If no, then we need not worry about quantum computers breaking classical encryption.
If yes, then we will effectively be on the path a quantum internet that is radically more secure and faster. Of course, we are a long way from that so not to worry right now. Encryption standards are being worked on to make then quantum resistant. Since we will not see those computers rolling out next week, I believe the problem will be solved.
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Yeah, I believe experts estimate that quantum error correction is about 40-50 years away. I also read a really interesting paper saying it might be impossible due to some yet unknown physical law. The author suggests that NP-hard problems might be intrinsically hard.
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