What is the quantum threat and what has simple maths got to do with protecting global security?

Q-Day is when a quantum computer so powerful is built it could break the public encryption systems. How concerned should we be?

https://www.euronews.com/next/2024/01/26/what-is-the-quantum-threat-and-what-has-simple-maths-got-to-do-with-protecting-global-secu

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