IonQ details 26‑day break of secp256k1 with 20k qubits, pulling Q‑Day toward 2028

IonQ published an end-to-end, fault-tolerant resource estimate to break 256‑bit ECC (secp256k1) in under 26 days using 19,397 physical qubits and 1,457 logical qubits, leveraging its Walking Cat architecture. Company guidance and independent coverage place Q‑Day as early as 2028, compressing migration windows for finance and critical infrastructure.