arXiv:1311.2638 [quant-ph]AbstractReferencesReviewsResources
Recurrent construction of optimal entanglement witnesses for 2N qubit systems
Justyna P. Zwolak, Dariusz Chruściński
Published 2013-11-11Version 1
We provide a recurrent construction of entanglement witnesses for a bipartite systems living in a Hilbert space corresponding to $2N$ qubits ($N$ qubits in each subsystem). Our construction provides a new method of generalization of the Robertson map that naturally meshes with $2N$ qubit systems, i.e., its structure respects the $2^{2N}$ growth of the state space. We prove that for $N>1$ these witnesses are indecomposable and optimal. As a byproduct we provide a new family of PPT (Positive Partial Transpose) entangled states.
Comments: 5 pages, 2 figures
Journal: Phys. Rev. A 89, 052314 (2014)
Keywords: optimal entanglement witnesses, 2n qubit systems, recurrent construction, bipartite systems, positive partial transpose
Tags: journal article
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