Crypto Banter Google’s New Quantum Computer Could Kill Crypto By 2029
Mar 31, 2026
Kostas Krypto, a cryptography and quantum advisor focused on post-quantum migration, joins to dissect Google’s quantum claims. He breaks down qubit realities and why timelines can be misleading. They map practical blockchain risks and why migration is slow. The conversation weighs cautious preparedness against outright panic.
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Google Flags 2029 As Post‑Quantum Deadline
- Google updated its internal migration deadline to 2029 citing advances that could make ECC signatures vulnerable sooner than expected.
- Their paper estimates <500,000 qubits and a nine-minute attack on Bitcoin's signing process if that hypothetical hardware existed.
Logical Qubits, Not Physical Ones, Drive The Risk
- Logical qubits (error-corrected qubits) differ from raw physical qubits and remain the scarce resource for scaling quantum attacks.
- Kostas says current practical logical qubit counts are tiny, and we need many orders of magnitude more—likely decades away.
Begin Post‑Quantum Migration Planning Today
- Start preparing now because standards and government mandates (NIST timelines) push organizations toward post‑quantum algorithms by 2030–2035.
- Google is setting an earlier internal deadline to give businesses time for migration, testing, and audits.