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.
@article{arxiv.0909.2743,
title = {Experimental generation of pseudo bound entanglement},
author = {H. Kampermann and X. Peng and D. Bruss and D. Suter},
journal= {arXiv preprint arXiv:0909.2743},
year = {2010}
}