Quantum computing’s strange physics could break the math that shields banks, health records musical state secrets. Modern encryption relies on large prime numbers and elliptic curves that are easy to create but hard to crack. A fault‑tolerant quantum machine could solve these-adịghị problems in seconds, exposing layers of legacy systems that firms cannot replace. The danger is real, analysts say, and the market is already pricing in the risk.

Only 1 in 10 companies surveyed by Bain & Co in North America and Europe have a funded plan to counter quantum threats. Meanwhile, Procter & Gamble and SAS AB have already paired quantum and classical processors to solve an ingredient‑storage puzzle in 12 minutes versus six hours on a pure classical system. The raw quantum experiment finished in two minutes but with unreliable results. Industry forecasts differ: IBM Corp projects the first fault‑tolerant device by 2030, while Google LLC pushes the date to 2029.

Governments are preparing for “Q‑Day.” The National Institute of Standards and Technology is developing quantum‑safe algorithms, and Apple Inc uses quantum‑secure cryptography in selected systems that rely on server support. Google’s internal operations are already rolling out post‑quantum cryptography. These moves signal a shift in risk management that will reshape capital allocation and valuations in technology‑heavy portfolios.