E. Agudelo, J. Sperling, W. Vogel
Regular quasiprobabilities are introduced for the aim of characterizing quantum correlations of multi-mode radiation fields. Negativities of these quantum-correlation quasiprobabilities are necessary and sufficient for any quantum correlation encoded in the multi-mode Glauber-Sudarshan P function. The strength of the method is demonstrated for a two-mode phase randomized squeezed-vacuum state. It has no entanglement, no quantum discord, a positive Wigner function, and a classical reduced single-mode representation. Our method clearly visualizes the quantum correlations of this state.
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http://arxiv.org/abs/1211.1585
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