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Quantum Criticality Could Be a Boon for Qubit Designers


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Schematic of a Kondo lattice. Extended to a lattice of magnetic impurities, the Kondo effect likely explains the formation of heavy fermions and Kondo insulators in intermetallic compounds.

A new technique developed by researchers at Rice University and the Vienna University of Technology can transform the quantum behavior of an intermetallic crystal of cerium, palladium, and silicon so electrons compete to occupy either orbitals or spin states.

Credit: Mohammad H. Hamidian et al

Researchers at Rice University and the Vienna University of Technology (TU Wien) in Austria have developed a method to transform the quantum behavior of an intermetallic crystal of cerium, palladium, and silicon in two unique ways: one in which electrons compete to occupy orbitals; and another where they compete to occupy spin states.

This discovery could be important for scientists trying to develop quantum computers.

The researchers created a theoretical model that contains both spins and orbitals. Their analysis of the model revealed a surprising form of quantum criticality.

Said Rice University researcher Ang Cai, "Even though this is a soup of things—spins, orbitals that are all strongly coupled to each other and to background conduction electrons—we could resolve two quantum critical points in this one system under the tuning of one parameter, which is the magnetic field."

From Rice University
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Abstracts Copyright © 2019 SmithBucklin, Washington, DC, USA


 

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