Sudden change in dynamics of genuine multipartite entanglement of cavity-reservoir qubits

TL;DR

This paper investigates the dynamics of genuine multipartite entanglement in a four-qubit cavity-reservoir system, revealing a sudden transition in entanglement that is sensitive to noise and occurs during a specific time window.

Contribution

It introduces a computable entanglement monotone to analyze multipartite entanglement dynamics and uncovers a novel sudden transition phenomenon in a cavity-reservoir system.

Findings

Sudden transition in entanglement dynamics observed for a specific initial state.

Transition occurs when neither cavity-cavity nor reservoir-reservoir qubits are entangled.

Transition is highly sensitive to white noise.

Abstract

We study the dynamics of genuine multipartite entanglement for a system of four qubits. Using a computable entanglement monotone for multipartite systems, we investigate the as yet unexplored aspects of a cavity-reservoir system of qubits. For one specific initial state, we observe a sudden transition in the dynamics of genuine entanglement for the four qubits. This sudden change occurs only during a time window where neither cavity-cavity qubits nor reservoir-reservoir qubits are entangled. We show that this sudden change in dynamics of this specific state is extremely sensitive to white noise.