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Title: Non-negative Wigner functions for orbital angular momentum states
Author: Rigas, I.
Sanchez-Soto, L.L.
Klimov, Andrei B.
Rehacek, J.
Hradil, Z.
Issue Date: 2010
Abstract: The Wigner function of a pure continuous-variable quantum state is non-negative if and only if the state is Gaussian. Here we show that for the canonical pair angle and angular momentum, the only pure states with non-negative Wigner functions are the eigenstates of the angular momentum. Some implications of this surprising result are discussed. © 2010 The American Physical Society.
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