Experimental generation of pseudo bound entanglement

TL;DR

This paper reports the experimental creation of a pseudo bound entangled state using NMR with three qubits, demonstrating its entanglement despite positive partial transposition, and characterizing it through state tomography.

Contribution

First experimental generation and characterization of a pseudo bound entangled state in a three-qubit NMR system, confirming its entanglement and positive partial transposition.

Findings

State has positive partial transposition in all bipartitions

Entanglement verified with a witness operator

State tomography confirms the generated state's properties

Abstract

We use Nuclear Magnetic Resonance (NMR) to experimentally generate a bound entangled (more precisely: pseudo bound entangled) state, i.e. a quantum state which is non-distillable but nevertheless entangled. Our quantum system consists of three qubits. We characterize the produced state via state tomography to show that the created state has a positive partial transposition with respect to any bipartite splitting, and we use a witness operator to prove its entanglement.