Negativity of the Wigner function as an indicator of non-classicality
Anatole Kenfack, Karol yczkowski · Journal of Optics B Quantum and Semiclassical Optics · 2004
A measure of non-classicality of quantum states based on the volume of the negative part of the Wigner function is proposed. We analyse this quantity for Fock states, squeezed displaced Fock states and cat-like states defined as coherent superposition of two Gaussian wavepackets.