Designer Spin Pseudomolecule Implemented with Trapped Ions in a Magnetic Gradient

TL;DR

This paper demonstrates the experimental implementation of a pseudomolecule of trapped ions with tunable magnetic coupling, enabling high-fidelity spin control and quantum gate operations, advancing scalable quantum computing.

Contribution

It introduces a novel trapped ion pseudomolecule with adjustable magnetic coupling and demonstrates quantum gates between non-nearest neighbors.

Findings

High-fidelity individual spin addressing

Implementation of Controlled-NOT gates between non-nearest neighbors

Potential for scalable quantum information processing

Abstract

We report on the experimental investigation of an individual pseudomolecule using trapped ions with adjustable magnetically induced J-type coupling between spin states. Resonances of individual spins are well separated and are addressed with high fidelity. Quantum gates are carried out using microwave radiation in the presence of thermal excitation of the pseudomolecule's vibrations. Demonstrating Controlled-NOT gates between non-nearest neighbors serves as a proof-of-principle of a quantum bus employing a spin chain. Combining advantageous features of nuclear magnetic resonance experiments and trapped ions, respectively, opens up a new avenue towards scalable quantum information processing.