MERLIN SCIENCE — Posner Molecules as Nuclear-Spin Qubits in the Warm Brain — E8 Intelligence Research

The finding is this: Posner molecules, Ca₉(PO₄)₆, can act as nuclear-spin qubits in a warm, wet brain because the phosphorus-31 nuclei inside them are shielded from decoherence. Six phosphate groups sit on the vertices of an octahedron, and each ³¹P has nuclear spin one-half. That gives you a six-qubit Hilbert space, sixty-four states, and coherence times in the solid state reported at thousands of seconds. Compare that to electronic decoherence in water, which runs femtoseconds to picoseconds. The protection factor is somewhere between ten to the twelfth and ten to the seventeenth. The field context is straightforward. Quantum brain hypotheses have always stumbled on the warm, wet, noisy objection, and rightly so. Electronic coherence does not survive. But nuclear spins are a different story. They are weakly coupled to their environment. In hydroxyapatite, ³¹P T₂ values reach ten to the fourth seconds. Fisher's entanglement condition requires the decoherence rate to stay below the ne Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com