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Ghost $r$-SICs, previously only conjectured to exist, are now explicitly constructed and linked to Hermitian $r$-SICs via modular dilogarithm identities.
State-preparation-and-measurement noise induces an unavoidable $\Omega(1)$ uncertainty in Lindbladian tomography, yet all universally gauge-invariant open-system dynamics can still be learned with strictly logarithmic scaling in system size using only single-qubit control.