Entanglement is a fundamental concept in quantum mechanics. In this review, we study various aspects of coherence and entanglement, illustrated by several examples. We relate the concepts of loss of coherence and disentanglement, via a model of two two-level atoms in different types of reservoir, including cases of both independent and common baths. Finally, we relate decoherence and disentanglement, by focusing on the sudden death of the entanglement and the dependence of the death time with the distance of our initial condition from the decoherence-free subspace. In particular, we study the sudden death of the entanglement in a two-atom system with a common reservoir.
© 2010 Optical Society of America
Original Manuscript: November 2, 2009
Revised Manuscript: January 19, 2010
Manuscript Accepted: January 19, 2010
Published: March 17, 2010
(2010) Advances in Optics and Photonics
Miguel Orszag and Maritza Hernandez, "Coherence and entanglement in a two-qubit system," Adv. Opt. Photon. 2, 229-286 (2010)