Spin-orbit thermal entanglement in a rare-earth-metal ion: Susceptibility witness
O. S. Duarte, C. S. Castro, Mario S. Reis · Physical Review A · 2013
In the present work, we explore the thermal entanglement between spin and orbital angular momentum in a rare-earth ion. A witness, based on the magnetic susceptibility and capable of revealing entanglement between these two angular momenta of different nature, is introduced. We found entanglement temperatures of 322 K for promethium and 715 K for samarium. These high temperatures make interesting the use of rare-earth in applications of quantum-information processes at room temperature.