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The first witness 
, Eq. (4), adapted from the time-domain to the domain of the angles of several applied transformations, detects quantum coherence in almost the whole range of the prepared states ρ0 (see text) as a function of different angle settings of wave plates (φ, θ): 0 ≤ φ ≤ π/4 and 0 ≤ θ ≤ π/2.
