Entanglement witnesses for d ⊗ d systems and new classes of entangled qudit states
Institute of Physics, Nicolaus Copernicus
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Received: 11 August 2010
Received in final form: 13 December 2010
Published online: 18 March 2011
We provide a new class of entanglement witnesses for d ⊗ d systems (two qudits). Our construction generalizes the one proposed recently by Jafarizadeh et al. for d = 3 and d = 4 on the basis of semidefinite linear programming. Moreover, we provide a new class of PPT entangled states detected by our witnesses which generalizes well known family of states constructed by Horodecki et al. for d = 3.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011