A "perfect tensor" is defined on the nLab very abstractly as "its tensor/hom-adjuncts $V^{\otimes k} \to V^{\otimes n - k}$ for $k \le n/2$ are isometries". The only example I'm aware of is the one used in the construction of the HaPPY code. What are other examples?
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1$\begingroup$ There are several examples in the Appendix A of the paper referenced to on that nLab page. $\endgroup$– მამუკა ჯიბლაძეCommented Aug 22, 2022 at 18:01
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