We present the visible entangled states of 4-qubit system which can be observed easily in physical laboratories. This was motivated from the fact that the entangled state of 2-qubit system comes from singlet and triplet states which are constructed through the angular momentum addition formalism. We show that 4-qubit system has the new entangled states different from GHZ or W types entangled states
@article{arxiv.quant-ph/0212136,
title = {Entangled multiplet by angular momentum addition},
author = {Hyuk-jae Lee and Sung Dahm Oh and Doyeol Ahn},
journal= {arXiv preprint arXiv:quant-ph/0212136},
year = {2007}
}