We provide a multi-parameter family of 2-qudit PPT entangled states which generalizes the celebrated Horodecki state in 3 x 3. The entanglement of this family is identified via semidefinite programming based on "PPT symmetric extensions" by Doherty et al.
@article{arxiv.1101.5754,
title = {A family of generalized Horodecki-like entangled states},
author = {Dariusz Chruściński and Adam Rutkowski},
journal= {arXiv preprint arXiv:1101.5754},
year = {2011}
}