Explicit discrete SU(2)⊗SU(2) and SU(4) Wigner functions are derived for two-qubit and ququart states, and a difference between the Wigner function and the product of its marginals is proposed as a qualitative quantum-correlation indicator for X-states.
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Representations of two-qubit and ququart states via discrete Wigner functions
Explicit discrete SU(2)⊗SU(2) and SU(4) Wigner functions are derived for two-qubit and ququart states, and a difference between the Wigner function and the product of its marginals is proposed as a qualitative quantum-correlation indicator for X-states.