C*-algebra Clifford algebra Dirac equation Euclidean Jordan algebras Fermion Gaussian states Gaussian unitary operations Hadamard matrix Hubbard model Jordan algebras Pauli exclusion principle Q1-390 QA1-939 Shannon information Thirring model Wigner-friend experiment X-ray spectroscopy X-rays adiabatic quantum computing agent algebraic quantum theory bic Book Industry Communication::P Mathematics & science binary optimization blind source separation (BSS) bohrification braid group causal sets causality characterization of unitary group and state spaces classical context