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Projected Advancement of Quantum‑Computing Threats to Bitcoin (Q‑Day Shift) — E8 Intelligence Research

Andrew Stewart Caldin

Published May 29, 2026• 0 citations
Publisher

Abstract

Discovered via YouTube Monitor: "Google Just Moved Q-Day Up By 6 Years (Nobody Is Talking About This)" (Julia McCoy) URL: https://www.youtube.com/watch?v=OYaODWIg8Ok Julia McCoy argues that breakthroughs in quantum hardware will enable a practical attack on Bitcoin's cryptographic chain by 2029, effectively moving the anticipated 'Q‑Day' six years earlier than most academic forecasts. She cites recent improvements in error‑corrected qubit counts and reduced decoherence times as the technical drivers of this acceleration. Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com

DOI
10.5281/zenodo.20436283

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Discovered via YouTube Monitor: "Google Just Moved Q-Day Up By 6 Years (Nobody Is Talking About This)" (Julia McCoy) URL: https://www.youtube.com/watch?v=OYaODWIg8Ok Julia McCoy argues that breakthroughs in quantum hardware will enable a practical attack on Bitcoin's cryptographic chain by 2029, effectively moving the anticipated 'Q‑Day' six years earlier than most academic forecasts. She cites recent improvements in error‑corrected qubit counts and reduced decoherence times as the technical drivers of this acceleration. Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com
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Quantum computing is rapidly advancing, and it presents an unprecedented threat to modern encryption. Within the next two decades, quantum computing may lead to a global cybersecurity crisis dubbed Q-day. This is when quantum computing will be capable of breaking the encryption methods underpinning the internet and other digital processes. This scenario threatens individual privacy, global economic stability, and national security infrastructures. The actual timeline for quantum threats is uncertain, but it is urgent that quantum-resistant cryptography is developed and implemented. The paper examines the current state and projected growth of quantum computing capabilities by focusing on metrics including quantum volume, coherence time, and coherence gain. The paper also highlights the period from 2025 to 2030, as significant breakthroughs in quantum computing may occur during that time due to enhanced qubit scaling, error correction, and algorithm efficiency. Looking ahead a decade from now, 2034, the landscape of cryptography will be significantly different. By then, it is highly probable that quantum computers will achieve a quantum volume of around 107 qubits, with a low error rate of 10-3 or better. This level of quantum computing power makes widely used cryptographic systems, for instance, RSA-1024, vulnerable to disruption. Consequently, there is a narrow window of opportunity to adapt and prepare. This applies to areas such as Public Key Infrastructure (PKI), Post-Quantum Cryptography (PQC), and Quantum Key Distribution (QKD). The paper underscores the importance of a coordinated global effort to develop, standardize, and implement quantum-resistant cryptographic solutions before it is too late.