Stationary discord and non-local correlations via qubit damping

Abstract

By using quantum discord (QD), measurement induced non-locality (MIN) and negativity (QE), quantum correlation and entanglement are investigated for two qubits in two different cases for the initial two qubit Werner states, taking into account the influence of qubit damping. It is shown that there is no asymptotic decay for MIN while asymptotic decay exists for QD and QE. Quantum correlations cannot be strengthened by introducing the damping. The appearance time of stationary correlations gets shorter with the increase in the damping parameter. Finally, a uniform damping qubit can affect the stationary correlations when the qubits are initially in an entangled state.

Keywords:

• quantum discord
• measurement induced non-locality
• qubit damping

Acknowledgements

This project was supported by the deanship of scientific research at Salman bin Abdulaziz university under the research Project no. 2014/01/1421.