A family of generalized Horodecki-like entangled states
  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. 
Dariusz Chru\'sci\'nski, Adam Rutkowski
quant-ph