From Qubits to Quantum Advantage

From Qubits to Quantum Advantage is a technically grounded introduction to quantum computing for security professionals, engineers, researchers, and advanced students seeking a clear and realistic understanding of this emerging technology.

Written by Jeremy Green, an experienced security architect, author, and PhD researcher, this book explains how quantum computing works in practice-without hype, speculation, or unnecessary mathematics. It focuses on the physical principles, computational models, and architectural constraints that define what quantum computers can, and cannot, do today.

The book takes the reader from first principles to real-world implications, covering the foundations required to reason accurately about quantum-enabled risk, opportunity, and future capability.

Inside, you will explore:

• What qubits are and how superposition, entanglement, and measurement are used computationally
• How quantum computing differs from classical computing at a fundamental level
• Quantum circuits, gates, and the realities of quantum hardware
• Key quantum algorithms, including Shor's and Grover's, and their implications for cryptography
• The NISQ era, error correction, and the challenges of fault-tolerant quantum systems
• Practical applications in optimisation, cybersecurity, and machine learning
• Public industry roadmaps from IBM, Microsoft, and Quantinuum-examined critically rather than speculatively

Drawing on over 120 academic sources, the book bridges theory and practice, demystifying quantum mechanics while remaining firmly grounded in engineering and operational reality. It is not a pop-science overview, nor a purely mathematical text, but a structured foundation for professionals who need to understand quantum computing beyond headlines and hype.

This book serves as a conceptual precursor to Quantum Security, establishing the technical understanding required to assess cryptographic risk, governance challenges, and the long-term security impact of quantum technologies. Whether you are preparing for post-quantum cryptography, academic research, or strategic decision-making, From Qubits to Quantum Advantage provides the essential foundation.