Interestingly, EWs and states considered in this paper belong to the well-known class of Bell diagonal operators42,43,44,45,46,47,48. Introducing a set of unitary Weyl operators in \(\mathbb {C}^d\)
$$\begin{aligned} W_{k\ell } = \sum _{j=0}^{d-1}…
A mirrored pair of optimal non-decomposable entanglement witnesses for two qudits does exist
