Material Science for Quantum Computing with Atom Chips

TL;DR

This paper discusses how material science advances can improve atom chip technology for quantum computing by enhancing control, reducing noise, and enabling more gate operations, with analysis of fabrication effects and future directions.

Contribution

It highlights the critical role of material science in optimizing atom chips for quantum computing, including analysis of fabrication imperfections and alternative approaches.

Findings

Nanofabricated wires enable over 10,000 gate operations.

Fabrication imperfections and Casimir-Polder forces impact performance.

Alternative wire approaches may improve control and coherence.

Abstract

In its most general form, the atom chip is a device in which neutral or charged particles are positioned in an isolating environment such as vacuum (or even a carbon solid state lattice) near the chip surface. The chip may then be used to interact in a highly controlled manner with the quantum state. I outline the importance of material science to quantum computing (QC) with atom chips, where the latter may be utilized for many, if not all, suggested implementations of QC. Material science is important both for enhancing the control coupling to the quantum system for preparation and manipulation as well as measurement, and for suppressing the uncontrolled coupling giving rise to low fidelity through static and dynamic effects such as potential corrugations and noise. As a case study, atom chips for neutral ground state atoms are analyzed and it is shown that nanofabricated wires will allow for more than $10^4$ gate operations when considering spin-flips and decoherence. The effects of fabrication imperfections and the Casimir-Polder force are also analyzed. In addition, alternative approaches to current-carrying wires are briefly described. Finally, an outlook of what materials and geometries may be required is presented, as well as an outline of directions for further study.