Predominance of entanglement of formation over quantum discord under quantum channels

Abstract

We present a study of the behavior of two different figures of merit for quantum correlations, entanglement of formation and quantum discord, under quantum channels showing how the former can, counterintuitively, be more resilient to such environments spoiling effects. By exploiting strict conservation relations between the two measures and imposing necessary constraints on the initial conditions we are able to explicitly show this predominance is related to build-up of the system-environment correlations.

7 pages, 5 figures, RevTeX4

References in corpus (10)

• Quantum discord and the power of one qubit
• Sudden Death of Entanglement
• Robustness of quantum discord to sudden death
• Classical and quantum correlations under decoherence
• Linking Quantum Discord to Entanglement in a Measurement
• The problem with the geometric discord
• All non-classical correlations can be activated into distillable entanglement
• Quantum discord bounds the amount of distributed entanglement
• Conservation law for distributed entanglement of formation and quantum discord
• Quantum cost for sending entanglement

Cited by in corpus (6)

• Universal freezing of quantum correlations within the geometric approach
• Observation of environment-induced double sudden transitions in geometric quantum correlations
• Criticality, factorization and long-range correlations in the anisotropic XY-model
• Direct-dynamical entanglement-discord relations
• Mapping generalized Jaynes-Cummings interaction into correlated finite-sized systems
• Dominance of quantum over classical correlations: entropic and geometric approach