Appleby–Flammia–McConnell–Yard ray class field conjecture for SICs

From papers

Let d4d\geq 4, set Δd=(d+1)(d3)\Delta_d=(d+1)(d-3), and let Kd=\Q(Δd)K_d=\Q(\sqrt{\Delta_d}). For a Weyl–Heisenberg line-SIC SS in dimension dd, let \fieldvecS\fieldvec{S} denote its SIC field, and let Hd12H_{d'\infty_1\infty_2} be the ray class field of KdK_d with modulus d12d'\infty_1\infty_2, where d=dd'=d for odd dd and d=2dd'=2d for even dd. Appleby, Flammia, McConnell, and Yard's conjecture. At least one Weyl–Heisenberg line-SIC has \fieldvecS=Hd12\fieldvec{S}=H_{d'\infty_1\infty_2}, and every such line-SIC has \fieldvecS\fieldvec{S} a finite Galois extension of \Q\Q containing Hd12H_{d'\infty_1\infty_2}. The two assertions were verified in the cited dimensions and for all currently known SICs there, but remain conjectural in general.

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Sources & referencesView supporting material

Primary source

Gene S. Kopp and Jeffrey C. Lagarias, “SIC-POVMs and orders of real quadratic fields”, arXiv:2407.08048 (2026).

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