# Facets of quantum information under non-Markovian evolution

## TL;DR

This paper investigates two non-Markovian quantum noise models, RTN and NMD, analyzing their information flow, fidelity, coherence, and mixedness to understand their impact on quantum information processing.

## Contribution

It introduces a quantum information perspective to characterize RTN and NMD models, linking non-Markovianity with information flow and coherence dynamics.

## Key findings

- Memory effects align with quantum Fisher information flow.
- Gate and channel fidelities characterize the noise channels.
- Quantum coherence and mixedness are affected by the noise models.

## Abstract

We consider two non-Markovian models: Random Telegraph Noise (RTN) and non-Markovian dephasing (NMD). The memory in these models is studied from the perspective of quantum Fisher information flow. This is found to be consistent with the other well known witnesses of non-Markovianity. The two noise channels are characterized quantum information theoretically by studying their gate and channel fidelities. Further, the quantum coherence and its balance with mixedness is studied. This helps to put in perspective the role that the two noise channels can play in various facets of quantum information processing and quantum communication.