Trapped Ion Quantum Computing using Optical Tweezers and Electric Fields

TL;DR

This paper introduces a scalable trapped ion quantum computing architecture combining optical tweezers and electric fields, enabling long-range interactions without ground state cooling or Lamb-Dicke approximation.

Contribution

It presents a novel scheme that integrates optical tweezers with electric fields for scalable ion qubit interactions, avoiding traditional cooling requirements.

Findings

Electric fields enable long-range qubit interactions mediated by ion motion.

The scheme does not require ground state cooling or Lamb-Dicke approximation.

Analysis of effects of imperfect cooling and unwanted entanglement.

Abstract

We propose a new scalable architecture for trapped ion quantum computing that combines optical tweezers delivering qubit state-dependent local potentials with oscillating electric fields. Since the electric field allows for long-range qubit-qubit interactions mediated by the center-of-mass motion of the ion crystal alone, it is inherently scalable to large ion crystals. Furthermore, our proposed scheme does not rely on either ground state cooling or the Lamb-Dicke approximation. We study the effects of imperfect cooling of the ion crystal, as well as the role of unwanted qubit-motion entanglement, and discuss the prospects of implementing the state-dependent tweezers in the laboratory.