Individual addressing of ions using magnetic field gradients in a surface-electrode ion trap

TL;DR

This paper demonstrates individual ion addressing in a microfabricated surface-electrode trap using an on-chip magnetic field gradient, achieving high frequency splitting and low crosstalk for scalable quantum computing.

Contribution

It introduces a method for individual ion addressing with magnetic field gradients in microfabricated traps, enabling scalable quantum information processing.

Findings

Achieved 310 kHz frequency splitting for 5 μm-separated ions.

Performed selective single-qubit operations with 2.2% crosstalk.

Coherence time remains unaffected by the magnetic field gradient.

Abstract

Dense array of ions in microfabricated traps represent one possible way to scale up ion trap quantum computing. The ability to address individual ions is an important component of such a scheme. We demonstrate individual addressing of trapped ions in a microfabricated surface-electrode trap using a magnetic field gradient generated on-chip. A frequency splitting of 310(2) kHz for two ions separated by 5 um is achieved. Selective single qubit operations are performed on one of two trapped ions with an average of 2.2+/-1.0% crosstalk. Coherence time as measured by the spin-echo technique is unaffected by the field gradient.