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Robustness of different indicators of quantumness in the presence of dissipation

Giorgi, Gian Luca; Galve, Fernando; Zambrini Roberta
International Journal of Quantum Information 9, 1825-1836 (2011)

The dynamics of a pair of coupled harmonic oscillators in separate or common thermal environments is studied, focusing on different indicators of quantumness, such as entanglement, twin oscillators correlations and quantum discord. We compare their decay under the effect of dissipation and show, through a phase diagram, that entanglement is more likely to survive asymptotically than twin oscillators correlations.