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We propose a hybrid approach to the experimental assessment of the genuinequantum features of a general system consisting of microscopic and macroscopicparts. We infer entanglement by combining dichotomic measurements on abidimensional system and phase-space inference through the Wigner distributionassociated with the macroscopic component of the state. As a benchmark, weinvestigate the feasibility of our proposal in a bipartite-entangled statecomposed of a single-photon and a multiphoton field. Our analysis shows that,under ideal conditions, maximal violation of a Clauser-Horne-Shimony-Holt-basedinequality is achievable regardless of the number of photons in the macroscopicpart of the state. The difficulty in observing entanglement when losses anddetection inefficiency are included can be overcome by using a hybridentanglement witness that allows efficient correction for losses in thefew-photon regime.

Hybrid methods for witnessing entanglement in a microscopic-macroscopic system