Long-range quantum gates using dipolar crystals

TL;DR

This paper introduces a method for long-range quantum gates using dipolar spin chains, leveraging phase transitions to achieve robust qubit interactions in various experimental platforms.

Contribution

It proposes a novel approach to implement long-range quantum gates via adiabatic ground state evolution in dipolar chains, demonstrating robustness against disorder.

Findings

High-fidelity qubit coupling achievable with realistic imperfections

Scaling relations for effective interactions derived

Applicable to ultracold Rydberg atoms and NV centers

Abstract

We propose the use of dipolar spin chains to enable long-range quantum logic between distant qubits. In our approach, an effective interaction between remote qubits is achieved by adiabatically following the ground state of the dipolar chain across the paramagnet to crystal phase transition. We demonstrate that the proposed quantum gate is particularly robust against disorder and derive scaling relations, showing that high-fidelity qubit coupling is possible in the presence of realistic imperfections. Possible experimental implementations in systems ranging from ultracold Rydberg atoms to arrays of Nitrogen-Vacancy defect centers in diamond are discussed.