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PPT-distinguishability for the lattice maximally entangled states
We study the distinguishability of a particular type of maximally entangled states -- the "lattice states" using a new approach of semidefinite program. With this, we successfully construct all sets of four ququad-ququad orthogonal maximally entangled states that are locally indistinguishable and find some curious sets of six states having interesting property of distinguishability. Also, some of the problems arose from [Computation, 14, 1098-1106 (2014)] about the PPT-distinguishability of "lattice" maximally entangled states can be answered.