Time-evolution of entanglement and quantum discord of bipartite systems subject to 1/f^{\alpha} noise

TL;DR

This paper investigates how quantum entanglement and discord evolve over time in a bipartite system subjected to 1/f^{eta} noise, revealing conditions for decay, sudden death, and revivals.

Contribution

It introduces a model of quantum correlation dynamics under 1/f^{eta} noise using classical fluctuators, highlighting the impact of noise spectrum characteristics.

Findings

Entanglement and discord can decay monotonically or exhibit sudden death and revivals.

The noise spectrum's properties determine the correlation dynamics.

Classical fluctuators effectively model the environmental noise effects.

Abstract

We study the dynamics of quantum correlations for two non interacting qubits initially prepared in a maximally entangled state and then coupled with an external environment characterized by a noise spectrum of the form 1/f^{\alpha}. The noise spectrum is due to the interaction of each qubit with a collection of N_f classical fluctuators with fixed switching rates. We find that, depending on the characteristic of the noise spectrum considered, both entanglement and quantum discord display either a monotonic decay or the phenomena of sudden death and revivals.