  Focusing particularly on one-qubit and two-qubit systems, I explain how the
quantum state of a system of n qubits can be expressed as a real function--a
generalized Wigner function--on a discrete 2^n x 2^n phase space. The phase
space is based on the finite field having 2^n elements, and its geometric
structure leads naturally to the construction of a complete set of 2^n+1
mutually conjugate bases.
