The notion that quantum computers pose an imminent threat to bitcoin's security has been a topic of discussion, but recent studies suggest that the energy requirements for such an attack are astronomically high. Two papers, one focusing on the energy demands of quantum mining and the other on the replication of quantum factoring breakthroughs, provide a more nuanced understanding of the situation. The first paper estimates that a quantum mining operation would need approximately 10²³ qubits and 10²⁵ watts of power, which is comparable to the energy output of a star. The second paper demonstrates that many quantum factoring breakthroughs can be replicated using a 1981 home computer and a simple algorithm, casting doubt on the significance of these achievements.
While the threat of quantum computing to bitcoin's security is real, it is primarily focused on wallet security rather than mining. Developers are already working on solutions to mitigate this risk, including reducing key exposure and implementing quantum-resistant signatures. The current market sentiment reflects a low probability of bitcoin replacing its mining algorithm before 2027, but a higher likelihood of implementing upgrades to reduce wallet risk.