Engineering non-Gaussian entangled states with vortices by photon subtraction

We show how a quantum mechanical vortex state of a two-mode system can be generated from a squeezed vacuum by subtracting a photon. The vortex state has nonclassical properties; for example, its Wigner function can be negative, in contrast to the Wigner function of the two-mode squeezed vacuum. We show, by calculating the logarithmic negativity parameter, that the vortex state has stronger entanglement than the two-mode squeezed vacuum. IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

Engineering non-Gaussian entangled states with vortices by photon subtraction Academic Article