Dynamics of multi-qubit systems in noisy environment

TL;DR

This paper investigates how multi-qubit entanglement, specifically GHZ and W-states, decays in noisy environments, highlighting the effects of noise correlation, qubit number, and initial state on entanglement survival.

Contribution

It provides a comparative analysis of entanglement decay for GHZ and W-states under different noise conditions, revealing the fragility of GHZ states and the occurrence of entanglement sudden death.

Findings

GHZ states are more fragile than W-states.

Entanglement sudden death occurs only with non-correlated noise.

Entanglement decay depends on noise type, qubit number, and initial state.

Abstract

Some properties of multi-qubit systems interacting with noisy environment is discussed. The amount of the survival entanglement is quantified for the GHZ and W-states. It is shown that the entanglement decay depends on the noise type ( correlated or non-correlated), number of interacted qubits with the environment and the initial state which passes through this noisy environment. In general, the GHZ is more fragile than the W-state. The phenomena of entanglement sudden death appears only for non-correlated noise.