Towards a complete and continuous Wigner function for an ensemble of spins or qubits
Derek Harland, M. J. Everitt, Kae Nemoto, Todd Tilma, Timothy P. Spiller · Physical Review A · 2012
We present a quasiprobability distribution function for ensembles of spin-half particles or qubits that has many properties in common with Wigner's original function for systems of continuous variables. We show that this function provides clear and intuitive graphical representation of a wide variety of states, including Fock states, spin-coherent states, squeezed states, superpositions, and statistical mixtures. The distribution is capable of simultaneously representing several angular momentum shells.