Summary：**Experts Warn Q-Day May Cause Worldwide Internet Breakdown** *The countdown is on to Q-Day, when a

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**Experts Warn Q-Day May Cause Worldwide Internet Breakdown**
*The countdown is on to Q-Day, when an algorithm written more than 30 years ago could run on a quantum computer and compromise the security of data on the internet. How are we preparing?*

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### Introduction
Quantum computing is moving from laboratory curiosity to a tangible threat for today’s encryption standards. Experts refer to the looming moment as **Q‑Day**—the point when a sufficiently powerful quantum machine could solve the mathematical problems that protect everything from online banking to government communications. While the exact date remains uncertain, the consensus is clear: without proactive upgrades, the global internet could face a widespread breakdown of trust and confidentiality.

### Key Developments
Recent milestones have accelerated the timeline. In 2023, IBM unveiled a 1,121‑qubit processor, and Google’s Sycamore demonstrated quantum advantage on specific tasks. Simultaneously, researchers at the National Institute of Standards and Technology (NIST) have been narrowing down candidates for post‑quantum cryptographic algorithms, with four schemes selected for standardization in 2024. Governments are also acting: the U.S. National Security Agency issued directives mandating migration to quantum‑resistant protocols by 2030, while the European Union funded a €1 billion initiative to upgrade critical infrastructure.

### Industry Analysis
The cybersecurity sector is split between urgency and skepticism. Large cloud providers—AWS, Azure, and Google Cloud—have begun testing hybrid encryption schemes that pair classical RSA with lattice‑based alternatives, aiming to protect data today while preparing for tomorrow. Smaller enterprises,