A proposal for detecting the spin of a single electron in superfluid helium

TL;DR

This paper proposes a practical method to detect and control the spin of a single electron trapped in a bubble within superfluid helium, enabling advancements in quantum technology and superfluid physics exploration.

Contribution

It introduces a novel scheme using an opto-acoustic cavity to read out and manipulate the electron's spin in superfluid helium.

Findings

Proposed a trapping and detection scheme for electron spin in superfluid helium

Outlined potential for quantum technology applications

Suggested a platform for exploring superfluid helium physics

Abstract

The electron bubble in superfluid helium has two degrees of freedom that may offer exceptionally low dissipation: the electron's spin and the bubble's motion. If these degrees of freedom can be read out and controlled with sufficient sensitivity, they would provide a novel platform for realizing a range of quantum technologies and for exploring open questions in the physics of superfluid helium. Here we propose a practical scheme for accomplishing this by trapping an electron bubble inside a superfluid-filled opto-acoustic cavity.