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Without quantum error correction it isn't practical to use them for real world problems. Scott Aarson wrote a piece that touches on this https://www.quantamaga

• rstuart4133 5y ago
  But needing the development of quantum error correction actually invalidates one of the points the article makes: > Nic Carter pointed out that quantum breaks would be gradual rather than sudden. It's likely cracking quantum error correction won't be a gradual process. Instead one day it won't work, and the next day it will be possible to build very big quantum computers. I don't think that means QC will be a major problem for crypto. It's not like there aren't fixes already, and they've proved themselves to be collectively very adept at changing protocols and algorithms. Hell one of the changes they made to bitcoin is to add flag bits and a voting protocol that made future changes easier.