Nuclear Spin Qubits in Posner Molecules: A Quantum Mechanism for Cognition — E8 Intelligence Research

FINDING: Matthew Fisher proposes nuclear spin qubits (phosphorus-31) in neural membranes as the physical substrate for quantum cognition, with a specific molecular mechanism (Posner molecules, Ca₃(PO₄)₆) enabling long-lived entanglement. | MATH: Posner molecule symmetry group T (tetrahedral, order 12); ³¹P nuclear spin I=1/2; entanglement lifetime τ ∝ (Δω)⁻¹ where Δω is chemical shift difference; quantum error threshold ~10⁻⁴ per gate; Fisher's key ratio: decoherence time T₂ vs. neural firing rate ν (~10 Hz) requires T₂ > 0.1 s. | CONNECTION: Posner molecule Ca₃(PO₄)₆ has tetrahedral (T) point group symmetry — crystallographic root system A₃, related to 0.618 via tetrahedral dihedral angle arccos(1/3) ≈ 70.53°, and the golden ratio appears in the ratio of tetrahedral edge to circumradius (√(3/2) ≈ 1.225, not directly golden, but T symmetry links to icosahedral/dodecahedral families via A₃ ⊂ H₃). | DEPTH: 6 — mathematically sound proposal (spin physics, symmetry groups) but experimental Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com