Non-Subhomogeneity of Minimal Operator Systems over Positive Semidefinite and Lorentz Cones

The minimal operator systems over ${\rm Mat}_k(\mathbb C)_+$, $k\geqslant2$, and the Lorentz cones $\mathcal L_m$, $m\geqslant4$, are not subhomogeneous. For the $2\times2$ cone we construct extreme positive maps of arbitrarily large output dimension. Positive retracts give the remaining cases. Equivalently, for fixed $k\geqslant2$ and $d$, there exist $s>d$ and an entangled positive operator on $\mathbb C^k\otimes\mathbb C^s$ such that every compression of the second factor to $\mathbb C^d$ is separable.

Source: arXiv:2608.24648v1 - http://arxiv.org/abs/2608.24648v1 PDF: https://arxiv.org/pdf/2608.24648v1 Original Link: http://arxiv.org/abs/2608.24648v1