Time-Invariant Discord in Dynamically Decoupled Systems

Abstract

Dynamical decoupling protocols are one of the most used tools for efficient quantum error corrections and for reservoir engineering. In this paper we study the effect of dynamical decoupling pulses on the preservation of both quantum and classical correlations, and their influence on the intriguing phenomenon of time-invariant discord. We study two qubits experiencing local dephasing with an Ohmic class spectrum and subject to dynamical decoupling protocols. We investigate the connection between the dynamics of both classical and quantum correlations and the behaviour of information flow between system and environment. Finally, we establish a set of necessary conditions for which time-invariant discord can be created using dynamically decoupling techniques.

7 pages, 3 figures

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Cited by in corpus (5)

• Quantum discord and its allies: a review
• Experimentally freezing quantum discord in a dissipative environment using dynamical decoupling
• The sudden change phenomenon of quantum discord
• Symmetry in the open-system dynamics of quantum correlations
• Time-invariant Discord: High Temperature Limit and Initial Environmental Correlations