Symmetry Breaking in Posner Molecules Invalidates Naive Qubit Encoding — E8 Intelligence Research

Andrew Stewart Caldin

Published Oct 19, 2026• 0 citations

Abstract

FINDING: The Posner molecule Ca₉(PO₄)₆, proposed as a biological quantum information processor, has a dynamical ensemble that is NOT symmetric — breaking the assumed Hilbert space symmetry and invalidating naive qubit encoding. | MATH: The molecule's nuclear spin Hilbert space dimension is not the naive product of identical phosphate groups; symmetry breaking reduces the accessible subspace. Key structural constants: Ca₉(PO₄)₆ — 9 calcium ions, 6 phosphate tetrahedra. The paper (arXiv:2108.08822v2) demonstrates that the dynamical ensemble (time-averaged over molecular tumbling and internal motions) does not respect the full permutation symmetry of the 6 PO₄ groups. This implies the effective Hamiltonian H_eff ≠ Σᵢ Hᵢ (symmetric sum), but contains symmetry-breaking terms. The Hilbert space dimension d is not simply (2I+1)^N for N=³¹P nuclei (I=1/2), but is constrained by the actual molecular point group (likely C₃ or lower, not T_d or O_h). | CONNECTION: The phosphate tetrahedra (PO₄) a Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com

DOI: 10.5281/zenodo.23464967

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