Classical memoryless noise-induced maximally discordant mixed separable steady states

TL;DR

This paper studies how classical memoryless noise affects quantum correlations in two qubits, revealing conditions under which noise induces maximally discordant separable states and enhances quantum discord without entanglement.

Contribution

It demonstrates that independent classical noise can drive two-qubit systems to highly discordant separable steady states and can increase quantum discord independently of entanglement.

Findings

Global noise drives systems to maximally discordant separable states.

Independent noises enhance quantum discord without creating entanglement.

Noise can increase system randomness and quantum correlations in steady states.

Abstract

We have investigated the dynamics of quantum discord and entanglement for two qubits subject to independent global transverse and/or longitudinal memoryless noisy classical fields. Global transverse and/or longitudinal random fields are found to drive the system to maximally discordant mixed separable steady states for suitable initial conditions. Moreover, two independent noises in the system are found to enhance both the steady state randomness and quantum discord in the absence of entanglement for some initial states.