Recurrent construction of optimal entanglement witnesses for 2N qubit systems

Abstract

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.

5 pages, 2 figures

References in corpus (4)

• Entanglement detection
• Detecting Genuine Multipartite Entanglement with Two Local Measurements
• Optimal entanglement criterion for mixed quantum states
• Structural approximations to positive maps and entanglement breaking channels

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