2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/127140The quantum state of a system of qubits can be represented by a Wigner function on a discrete phase space, each axis of the phase space taking values in a finite field. Within this framework, we show that one can make sense of the notion of a "rotationally invariant state" of any collection of qubits, and that any such state is, in a well defined sense, a state of minimum uncertainty.Submitted to the proceedings of QCMC06Quantum Physicstext