Google Cuts Qubits Needed to Break Ethereum by 20x, but Ethereum Has a Plan

A Google Quantum AI paper published in March 2026 cut the estimated hardware needed to break Ethereum’s account security by 20 times, lowering prior estimates to roughly 1,200 logical qubits. According to BeInCrypto, Google set an internal 2029 deadline to migrate its own systems, while the Ethereum Foundation formed a Post-Quantum Security team in January 2026 led by Thomas Coratger and is weighing EIP-8141 for the Hegotá hard fork planned for the second half of 2026. The Foundation also launched the $1 million Poseidon Prize and says full readiness targets approximately 2029.