# Quantum Electronic Structure at the Interface of Solid Neon and Superfluid Helium

## TL;DR

This paper predicts a novel quantum electronic structure at the interface of solid neon and superfluid helium, where electrons form a nanometric dome and can be used as qubits for scalable quantum computing.

## Contribution

It introduces a new quantum electronic system at a noble-gas interface with potential for quantum information processing.

## Key findings

- Electrons self-confine into nanometric domes at the interface.
- Electrons can form a classical Wigner crystal.
- Ultralong spin-coherence times enable quantum bit applications.

## Abstract

We predict a new quantum electronic structure at the interface between two condensed phases of noble-gas elements: solid neon and superfluid helium. An excess electron injected onto this interface self-confines its wavefunction into a nanometric dome structure whose size varies with pressure. A collection of such electrons can form a classical Wigner crystal visualizable by mid-infrared photons. The ultralong spin-coherence time allows the electrons in this system to serve as perfect quantum bits. They can be deterministically arranged on-chip at a spacing of several microns. Their spin states can be controlled and readout by single-electron devices. This unique system offers an appealing new architecture for scalable quantum information processing.