# Polaronic Entanglement of Quantum dot Molecule in a voltage-controlled junction

## TL;DR

This paper explores how vibrational phonon modes affect entanglement in a quantum dot molecule under bias voltage, revealing mechanisms to preserve and control entanglement despite phonon-induced decoherence.

## Contribution

It introduces an asymmetric coupling protocol and bias voltage tuning to maintain and engineer entanglement in a phonon-influenced quantum dot system.

## Key findings

- Entanglement degrades with phonon decoherence but can be preserved using asymmetric coupling.
- Thermal entanglement exhibits degradation and rebirth influenced by temperature and phonon strength.
- Time-dependent bias voltage induces periodic entanglement revival and stabilization.

## Abstract

We investigate the influence of vibrational phonon modes on the entanglement through a quantum dot molecule under the bias voltage-driven field. The molecular quantum dot system can be realized by coupled quantum dots in the middle of the suspended carbon nanotube. This system would be described by the Anderson-Holstein model and also can be analyzed by the polaron master equation in Markovian regime. In the presence of electron-phonon interaction, we study the entanglement as a function of bias voltage and temperature. Despite entanglement degradation because of phonon decoherence, we employ an asymmetric coupling protocol to preserve the entanglement in a significant level and also we apply the easy tunable bias voltage driven to engineer its behavior. In dynamics of entanglement, we demonstrate the phenomenon of thermal entanglement degradation and rebirth through the increase of temperature. In this process, thermal entanglement revival is intensively affected by the strength of phonon decoherence. Such that, stronger revival is occurred for higher phonon coupling amount. With an applied time-dependent bias voltage, the entanglement evolution shows periodic revival by time and in response to bias voltage rising, it illustrates decreasing and grows steadily to reach the flat form with considerable magnitude.