Small Tweak Boosts Quantum Computer Efficiency

A small,counterintuitive tweak to advanced materials can improve how quantum computers hand off information inside their systems,making them more efficient,reliable and scalable.

In a paper recently published in advanced Electronic materials, a team from Sandia National Laboratories, the University of Arkansas and Dartmouth College found they improved the flow of electrical current through a specialized semiconductor device called a quantum well. This device is increasingly used to make telecommunications faster and more efficient, and researchers are exploring if it can have the same impact on quantum computers.

To visualize a quantum well, imagine a marble rolling in a groove between two raised edges. The marble can only move back and forth. A quantum well controls electrical current in a similar way, confining it in an ultrathin layer of material. this confinement improves how quickly you can encode information in light.

The new paper shows how to make these wells work even better, whether for quicker downloads and smoother online experiences or for better qubits and more efficient transmission of quantum information.

Supported by a grant from the department of Energy’s Office of Science, the study is part of the Manipulation of Atomic Ordering for Manufacturing Semiconductors initiative, a DOE Energy Frontier Research center based at the University of Arkansas. This collaborative effort has involved Sandia and nine universities working together since 2022 to uncover the scientific principles that govern the arrangement of atoms in semiconductor alloys. By discovering and using these scientific principles, the µ-ATOMS team seeks to develop materials that advance semiconductor technologies.

This newly published paper was led by the Sandia team at the Center for Integrated Nanotechnologies, an Office of Science user facility supporting national nanoscale science research, jointly operated by Sandia and Los Alamos national laboratories.

A little tin and silicon help current glide through semiconductors

Most studies on the same type of quantum well this team used have focused on barriers that are made of pure germanium to keep electrical current confined. Unexpectedly, the improvement the te