Experimental Reconstruction of Entanglement Quasiprobabilities
Jan Sperling, Evan Meyer-Scott, Sonja Barkhofen, Benjamin Brecht, Christine Silberhorn · Physical Review Letters · 2019
We report on the first experimental reconstruction of an entanglement quasiprobability. In contrast to related techniques, the negativities in our distributions are a necessary and sufficient identifier of separability and entanglement and enable a full characterization of the quantum state. A reconstruction algorithm is developed, a polarization Bell state is prepared, and its entanglement is certified based on the reconstructed entanglement quasiprobabilities, with a high significance and without correcting for imperfections.