A proposal for detecting the spin of a single electron in superfluid helium
J. Ma, Y. S. S. Patil, J. Yu, Y. Wang, J. G. E. Harris
arXiv:2308.07174 (2023)
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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.
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