This document discusses using quantum information science and quantum computing to model complex systems like the human brain. It proposes the "AdS/Brain Theory of Neural Signaling" which uses wavefunctions, tensor networks, and neural field theories at different scales from brain networks to molecules. Quantum computing could provide a new platform to model the brain across its nine orders of magnitude of complexity and help complete the human connectome by handling the large data and processing requirements. The AdS/Brain theory represents the first application of the AdS/CFT correspondence across multiple scales of the brain.