Self assembled Wigner crystals as mediators of spin currents and quantum information

TL;DR

This paper demonstrates that Wigner crystals in semiconductor quantum wires can reliably transmit quantum spin information over micrometer distances, with high fidelity and potential applications in quantum computing and spintronics.

Contribution

It introduces a novel method for quantum information transfer using emergent Wigner crystals, showing high fidelity and robustness in solid-state devices.

Findings

High-fidelity spin transmission over micrometers

Fidelity exceeds decoherence effects

Operates at dilution refrigerator temperatures

Abstract

Technological applications of many-body structures that emerge in gated devices under minimal control are largely unexplored. Here we show how emergent Wigner crystals in a semiconductor quantum wire can facilitate a pivotal requirement for a scalable quantum computer, namely transmitting quantum information encoded in spins faithfully over a distance of micrometers. The fidelity of the transmission is remarkably high, faster than the relevant decohering effects, independent of the details of the spatial charge configuration in the wire, and realizable in dilution refrigerator temperatures. The transfer can evidence near unitary many-body nonequilibrium dynamics hitherto unseen in a solid-state device. It could also be useful in spintronics as a method for pure spin current over a distance without charge movement.