The technology required to make Ethereum immune from a quantum attack could be developed starting “tomorrow,” said Buterin.
Ethereum is already “well-positioned” to mitigate the impact of a massive quantum computing attack on the network, according to Ethereum co-founder Vitalik Buterin.
In a March 9 post to Ethereum Research, Buterin discussed what would happen if a “quantum emergency” happened as early as tomorrow.
“Suppose that it is announced tomorrow that quantum computers are available, and bad actors already have access to them and are able to use them to steal users’ funds,” Buterin postulated.
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Source: https://cointelegraph.com/news/simple-hard-fork-subvert-quantum-attack-ethereum-vitalik-buterin