Google Warns Quantum Computers Could Break Encryption by 2029 as ECC Needs 20-Fold Fewer Qubits
Updated
Updated · CNN International · May 17
Google Warns Quantum Computers Could Break Encryption by 2029 as ECC Needs 20-Fold Fewer Qubits
5 articles · Updated · CNN International · May 17
Google said some encrypted systems could be hackable by 2029, sharply shortening the timeline for governments and companies to shift to post-quantum cryptography.
A March paper coauthored by Google researchers found elliptic curve cryptography could be broken with about 20 times fewer physical qubits than previously thought, raising pressure on cryptocurrencies and other ECC-based systems.
The risk is amplified by "harvest now, decrypt later" attacks, in which stolen encrypted data is stored until a cryptographically relevant quantum computer arrives; health records and financial data are seen as especially exposed.
NIST finalized quantum-resistant algorithms in 2024, but the White House targets 2035 for migration and experts say cryptographic transitions often take 10 to 20 years—longer than Google's new warning window.
More than 90% of businesses still lack a quantum-security road map, leaving a Y2K-like scramble possible if hidden state or private research brings Q-Day earlier than public estimates suggest.
As quantum threats grow, what is the true cost for businesses that fail to prepare for a post-quantum world?
Will hardware limitations and performance overhead derail the urgent global transition to post-quantum cryptography?
If Q-Day arrives before 2030, what is the global plan for a sudden collapse of digital trust?
Quantum Computing’s Leap: Qubit Requirements for Breaking Encryption Drop 10x–20x, Accelerating the Post-Quantum Security Crisis
Overview
In early 2026, quantum computing research saw a major breakthrough as multiple groups, including Caltech and Oratomic, announced dramatic reductions in the number of physical qubits needed to break widely used encryption schemes. This shift, achieved through novel error correction methods, moved the focus from simply increasing qubit counts to making quantum computers more efficient and practical. The new estimates suggest that fully operational quantum computers could be built with as few as 10,000 to 20,000 qubits, a significant drop from previous predictions of millions. These advancements signal a much faster timeline for practical quantum attacks and highlight the accelerating pace of the field.