Complete nonclassicality test with a photon-number-resolving detector
T. Kiesel, W. Vogel · Physical Review A · 2012
We present a method for the experimental measurement of nonclassicality witnesses and demonstrate its application. Our proposal requires only the coherent displacement of the initial state, which can be achieved by overlapping the latter with a coherent state at a beam splitter, and subsequent photon-number-resolved detection. This setup allows a complete test of nonclassicality of an arbitrary quantum state. The role of the quantum efficiency as well as statistical and systematic uncertainties are discussed. Finally, the scheme is demonstrated for a realistic example.