title: Environment-induced sudden transition in quantum discord dynamics.
abstract: Nonclassical correlations play a crucial role in the development of quantum information science. The recent discovery that nonclassical correlations can be present even in separable (nonentangled) states has broadened this scenario. This generalized quantum correlation has been increasing in relevance in several fields, among them quantum communication, quantum computation, quantum phase transitions, and biological systems. We demonstrate here the occurrence of the sudden-change phenomenon and immunity against some sources of noise for the quantum discord and its classical counterpart, in a room temperature nuclear magnetic resonance setup. The experiment is performed in a decohering environment causing loss of phase relations among the energy eigenstates and exchange of energy between system and environment, resulting in relaxation to the Gibbs ensemble.
authors: Empresa Brasileira de Pesquisa Agropecuária, Rua Jardim Botânico 1024, 22460-000 Rio de Janeiro, Rio de Janeiro, Brazil.
authors: R
authors: R
authors: Auccaise
authors: L C
authors: LC
authors: Céleri
authors: D O
authors: DO
authors: Soares-Pinto
authors: E R
authors: ER
authors: deAzevedo
authors: J
authors: J
authors: Maziero
authors: A M
authors: AM
authors: Souza
authors: T J
authors: TJ
authors: Bonagamba
authors: R S
authors: RS
authors: Sarthour
authors: I S
authors: IS
authors: Oliveira
authors: R M
authors: RM
authors: Serra