Non-Markovian quantum trajectory unravellings of entanglement

TL;DR

This paper develops a non-Markovian quantum trajectory approach to analyze entanglement dynamics in two-qubit systems coupled to a common bath, revealing non-Markovian effects on entanglement evolution.

Contribution

It introduces explicit time-local non-Markovian QSD equations for two-qubit models and applies diffusive trajectories to study entanglement in non-Markovian environments.

Findings

Non-Markovian features significantly influence entanglement dynamics.

Quantum diffusive unravellings reveal entanglement revivals and decay patterns.

The approach provides a new tool for analyzing open quantum systems in non-Markovian regimes.

Abstract

The fully quantized model of double qubits coupled to a common bath is solved using the quantum state diffusion (QSD) approach in the non-Markovian regime. We have established the explicit time-local non-Markovian QSD equations for the two-qubit dissipative and dephasing models. Diffusive quantum trajectories are applied to the entanglement estimation of two-qubit systems in a non-Markovian regime. In both cases, non-Markovian features of entanglement evolution are revealed through quantum diffusive unravellings in the system state space.