This chapter introduces the Quantum Information Dimension (QID), a proposed substrate that contains the full landscape of lawful quantum field configurations before collapse selects specific outcomes. Within the framework of the book, the QID represents the space of potential relations that quantum systems explore prior to measurement, where amplitude and phase encode the distinctions that may later appear as classical information once collapse occurs. The chapter develops this proposal by examining one of the most firmly established principles in modern physics, which is that information cannot be destroyed. From Landauer's principle to the resolution of the black hole information paradox, physics increasingly treats information as a conserved quantity. When considered alongside earlier chapters that proposed quantum coherence within biological systems and the possibility that consciousness interacts with quantum processes, information conservation raises a natural question about where unrealized possibilities persist once collapse commits a particular outcome. The QID is proposed as the configuration space in which these possibilities reside. In this view, collapse commits one relational pattern into the classical record while unrealized alternatives disperse through entanglement with the environment, which preserves global informational conservation. The chapter explores how this perspective connects with established ideas in physics including Feynman's path integral formulation, the holographic principle, and quantum critical systems capable of storing vast amounts of information at minimal energetic cost. From the framework's perspective, the QID offers a coherent way to interpret how information remains conserved while physical reality unfolds through successive collapse events. The chapter also considers how this informational substrate may relate to biological quantum coherence and the questions about consciousness that the following chapters explore.