Fig. 4
From: Quantum non-Gaussianity and secure quantum communication
a Critical squeezing rc to achieve secure quantum teleportation with respect to α for even-cat states (black crosses) and for coherent-state mixtures (orange triangles). b Critical squeezing rc versus logarithmic Wigner negativity WN. Each point corresponds to a randomly chosen mixed state in the Fock space |0〉, |1〉, and |2〉 (red dot: vacuum state)
