On the Stokes Parameters for Polarized Radiation*

The effect of a birefringent scatterer is to generate generalized Werner states, in full agreement with experimental results [21].

“Equation ͑31͒ clearly shows that the effect of a birefringent scatterer is to generate what we called generalized Werner states, in full agreement with our experimental results ͓21͔.”

In Ref. [21], using a setup similar to Fig. 1, the authors experimentally generated entangled two-qubit mixed states that lie upon and below the Werner curve in the linear entropy-tangle plane.

“In Ref. ͓21͔, by using a setup similar to the one shown in Fig. 1, we have experimentally generated entangled twoqubit mixed states that lie upon and below the Werner curve in the linear entropy-tangle plane ͓41͔.”

The qualitative agreement between the simulation and the experimental findings shown in Fig. 3 of Ref. [21] is evident.

“The qualitative agreement between the result of this simulation and the experimental findings shown in Fig. 3 of Ref. ͓21͔ is evident.”

The expression of M_Δ given in Eq. (26) is not the most general possible, but it is the correct one for the representation of pure depolarizers with zero polarizance, such as the ones used in Ref. [21].

“Actually, the expression of M ⌬ given in Eq. ͑26͒ is not the most general possible ͓26͔, but it is the correct one for the representation of pure depolarizers with zero polarizance, such as the ones used in Ref. ͓21͔.”