Witnessing spin-orbit thermal entanglement in rare-earth ions
1 Instituto de Física, Universidade Federal Fluminense - Av. Gal. Milton Tavares de Souza s/n, 24210-346 Niterói-RJ, Brazil
2 Instituto de Física de São Carlos, Universidade de São Paulo - P.O. Box 369, São Carlos, 13560-970 SP, Brazil
Received: 18 June 2013
Accepted: 6 August 2013
We explore spin-orbit thermal entanglement in rare-earth ions, based on a witness obtained from mean energies. The entanglement temperature TE, below which entanglement emerges, is found to be thousands of kelvins above room temperature for all light rare earths. This demonstrates the robustness to environmental fluctuations of entanglement between the internal degrees of freedom of a single ion.
PACS: 03.67.Mn – Entanglement measures, witnesses, and other characterizations / 75.50.Xx – Molecular magnets / 03.67.Bg – Entanglement production and manipulation
© EPLA, 2013