Abstract
Abstract In a Letter by Clarisse [L. Clarisse, Phys. Lett. A 359 (2006) 603–607] the open problem of the existence of ( 5 , 5 ) and ( 6 , 6 ) PPT edge states has been solved. Here we report the existence of another large class of ( 5 , 5 ) entangled edge states with positive partial transposes. We also give a PPT edge state with range dimensions ( 6 , 6 ) .
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