  It has been shown that entanglement distillation of Gaussian entangled states
by means of local photon subtraction can be improved by local Gaussian
transformations. Here we show that a similar effect can be expected for the
distillation of an asymmetric Gaussian entangled state that is produced by a
single squeezed beam. We show that for low initial entanglement, our largely
simplified protocol generates more entanglement than previous proposed
protocols. Furthermore, we show that the distillation scheme also works
efficiently on decohered entangled states as well as with a practical photon
subtraction setup.
