Sufficient condition for a quantum state to be genuinely quantum non-Gaussian

Weshow that the expectation value of the operator. (O) over cap equivalent to exp(-c (x) over cap (2)) + exp(-c (p) over cap (2)) defined by the position and momentum operators (x) over cap and (p) over cap with a positive parameter c can serve as a tool to identify quantum non-Gaussian states, that is states that cannot be represented as a mixture of Gaussian states. Our condition can be readily tested employing a highly efficient homodyne detection which unlike quantum-state tomography requires the measurements of only two orthogonal quadratures. We demonstrate that our method is even able to detect quantum non-Gaussian states with positive-definite Wigner functions. This situation cannot be addressed in terms of the negativity of the phasespace distribution. Moreover, we demonstrate that our condition can characterize quantum non-Gaussianity for the class of superposition states consisting of a vacuum and integer multiples of four photons under more than 50% signal attenuation.