Influence of intrinsic decoherence on tripartite entanglement and bipartite fidelity of polar molecules in pendular states

TL;DR

This paper investigates how intrinsic decoherence affects tripartite entanglement and bipartite fidelity in ultracold polar molecules under external electric fields, providing insights for optimizing quantum information processing.

Contribution

It analyzes the impact of intrinsic decoherence on entanglement and fidelity in polar molecular systems, considering various initial states and parameters, which is a novel approach.

Findings

Optimal parameter ranges for maximum entanglement and fidelity.

Intrinsic decoherence reduces entanglement and fidelity over time.

External field intensity and dipole interactions influence quantum correlations.

Abstract

An array of ultracold polar molecules trapped in an external electric field is regarded as a promising carrier of quantum information. Under the action of this field, molecules are compelled to undergo pendular oscillations by the Stark effect. Particular attention has been paid to the influence of intrinsic decoherence on the model of linear polar molecular pendular states, thereby we evaluate the tripartite entanglement with negativity, as well as fidelity of bipartite quantum systems for input and output signals using electric dipole moments of polar molecules as qubits. According to this study, we consider three typical initial states for both systems respectively, and investigate the temporal evolution with variable values of the external field intensity, the intrinsic decoherence factor and the dipole-dipole interaction. Thus we demonstrate the sound selection of these three main parameters to obtain the best entanglement degree and fidelity.