"In theory, quantum computing could break the cryptography securing crypto assets like Bitcoin and Ethereum, but Buterin reasons that quantum computers like the one announced by Google are more proofs of concepts than fully realized technologies. The current cryptography used in major blockchains may also be strong enough to resist even fully realized quantum computers meaning not all cryptography would be vulnerable.
Quantum computers can not only be used to break cryptography—they could also help build more powerful encryption. Upgrade plans are in place for blockchains like Ethereum to resist quantum computers.
The Future
Even if we’re safe for now, the crypto world is not taking any chances. Quantum resistant blockchains like Praxxis and QAN are already under development in preparation for the potential quantum apocalypse. We can rest assured knowing—even if quantum computers start taking over the world—our crypto will be safe. "
"In theory, quantum computing could break the cryptography securing crypto assets like Bitcoin and Ethereum, but Buterin reasons that quantum computers like the one announced by Google are more proofs of concepts than fully realized technologies. The current cryptography used in major blockchains may also be strong enough to resist even fully realized quantum computers meaning not all cryptography would be vulnerable.
Quantum computers can not only be used to break cryptography—they could also help build more powerful encryption. Upgrade plans are in place for blockchains like Ethereum to resist quantum computers.
The Future Even if we’re safe for now, the crypto world is not taking any chances. Quantum resistant blockchains like Praxxis and QAN are already under development in preparation for the potential quantum apocalypse. We can rest assured knowing—even if quantum computers start taking over the world—our crypto will be safe. "
https://decrypt.co/resources/quantum-computer-crypto-explainer-guide