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Suppose an n-qubit mixed state.

How to find out if it is entangled or not?

Can i use PPT criterion for that purpose?

If it is possible please give a reference related to that.

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  • $\begingroup$ No, PPT is only necessary and sufficient condition for $ 2 \times 2$ and $2 \times 3$ dimensional systems. $\endgroup$
    – FDGod
    Feb 12 at 17:16
  • $\begingroup$ @FDGod and Gaussian? $\endgroup$ Feb 14 at 14:12

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