  Entanglement potentials are a promising way to quantify the nonclassicality
of single-mode states. They are defined by the amount of entanglement
(expressed by, e.g., the Wootters concurrence) obtained after mixing the
examined single-mode state with a purely classical state; such as the vacuum or
a coherent state. We generalize the idea of entanglement potentials to other
quantum correlations: the EPR steering and Bell nonlocality, thus enabling us
to study mutual hierarchies of these nonclassicality potentials. Instead of the
usual vacuum and one-photon superposition states, we experimentally test this
concept using specially tailored polarization-encoded single-photon states. One
polarization encodes a given nonclassical single-mode state, while the other
serves as the vacuum place-holder. This technique proves to be experimentally
more convenient in comparison to the vacuum and a one-photon superposition as
it does not require the vacuum detection.
