I was looking at the PPT$^2$ conjecture (that if $\Phi$ is a PPT quantum channel, then $\Phi^2$ is entanglement breaking) and it said that there are examples of PPT channels that are not entanglement breaking. However, I can neither find any examples nor think of them. What is an example of such a channel?
2026-03-26 16:04:56.1774541096
Example of PPT channel that is not entanglement breaking
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