The most recent major industry and research predictions place Q-Day—the moment quantum computers can break standard public-key cryptography like RSA-2048 and elliptic curve systems—between 2028 and 2030, with several key updates shifting timelines closer:
IonQ CEO Prediction (September 2026): IonQ's CEO publicly projected that Q-Day could arrive as early as 2028.
https://finance.yahoo.com/markets/stocks/articles/ionq-ceo-says-q-day-153534215.html
Google Internal Security & Industry Estimates (2025–2026): Following algorithm optimizations (such as Craig Gidney's resource estimate revisions and the March 2026 AQTI JVG paper), Google updated its internal planning deadline to 2029, and major trackers like Is it Q-Day? estimate impact around 2028–2029.
Postquant Labs predicts Q-day arrives in March 2028.
General Consensus: Most enterprise and cybersecurity frameworks (such as F5 Labs and IBM/Google projections) target 2029–2030 for cryptographically relevant quantum systems, urging organizations to audit and migrate to post-quantum cryptography immediately.
Gartner Estimate: Projects public-key cryptography could become breakable as early as 2029.
https://postquantum.com/industry-news/gartner-quantum-pqc/
Cloud Security Alliance Estimate: Points to April 14, 2030.
Predictions and forecasts pointing to Q-Day in 2027 come from specific mathematical models, compliance deadlines, and predictive projects rather than a broad scientific consensus:
Fractal Mathematics Model: A study utilizing iterated function systems and fractal dimensions (approximately 1.618) projected a 70% probability of Q-Day arriving by late 2027.
NSA / CNSA 2.0 Mandates: The U.S. National Security Agency set a strict 2027 deadline for national security and defense contractors to begin acquiring and implementing quantum-resistant cryptographic standards under CNSA 2.0.
Q-Day Prediction Markets: Platforms like the Q-Day Prediction Market allow public forecasts and tracking windows that span up to 2027 (or earlier) for cryptographic breaks.
