The checkerboard family of entangled states of two qutrits
arXiv:0911.2797
Abstract
By modifying the method of Bruss and Peres, we construct two new families of entangled two qutrit states. For all density matrices in these families the (i,j)th entry is 0 for i+j odd. The first family depends on 27 independent real parameters and includes both PPT and NPT states. The second family consists of PPT entangled states. The number of independent real parameters of this family is at least 11.
8 pages, no figures. Proof of Theorem 2.1 has been simplified, a new short section with two examples inserted, and the last section is revised.