Robust nuclear spin entanglement via dipolar interactions in polar molecules

TL;DR

This paper presents a protocol for generating robust entangled states of nuclear and electron spins in ultracold polar molecules using electric dipolar interactions, enabling long-lived quantum states for quantum information processing.

Contribution

It introduces a method to encode spin-1/2 in molecular levels and demonstrates effective spin-spin interactions for entanglement creation.

Findings

Effective Ising and XXZ spin interactions are theoretically demonstrated.

Long-lived cluster and squeezed spin states can be generated.

Electric dipolar interactions are controlled via magnetic fields.

Abstract

We propose a general protocol for on-demand generation of robust entangled states of nuclear and/or electron spins of ultracold $^1\Sigma$ and $^2\Sigma$ polar molecules using electric dipolar interactions. By encoding a spin-1/2 degree of freedom in a combined set of spin and rotational molecular levels, we theoretically demonstrate the emergence of effective spin-spin interactions of the Ising and XXZ forms, enabled by efficient magnetic control over electric dipolar interactions. We show how to use these interactions to create long-lived cluster and squeezed spin states.