Entanglement, No-Signalling, and the Real Path to Quantum Advantage: A Systems-Level Primer for Practitioners and Policymakers

This primer explains the physical ideas behind quantum information—superposition, measurement, interference, and entanglement—while correcting the misconception that entanglement enables faster-than-light communication. It maps the path from noisy devices to error-corrected systems and connects algorithms, quantum simulation, post-quantum cryptography, and networking to practical engineering and policy questions.

• It separates quantum advantage in specific problem classes from the broader and unsupported idea that quantum computers make every computation faster.
• No-signalling, error correction, surface codes, teleportation, superdense coding, Shor's algorithm, and Grover's algorithm are placed inside one systems-level explanation.
• The policy layer asks how technical timelines, cryptography transitions, scientific infrastructure, and public investment should be discussed without hype.

This document is presented as a public reading copy connected to the Independent Observer program. Its source trail and status remain visible so readers can distinguish a working preprint from a released publication.

This Volume IV record is the accessible on-ramp to the quantum line of inquiry. It publishes a public-safe explanation and the SSRN record while keeping any local source files outside the website.

The public SSRN record lists 69 downloads and 549 abstract views in the indexed snapshot checked on 30 August 2026. The primer is an educational working paper; technical claims and projected timelines should be checked against current primary research and standards before informing procurement or policy.