Spin dynamics in quantum dots on liquid helium

• URL: http://arxiv.org/abs/2212.10683v1
• Date: Tue, 20 Dec 2022 22:58:37 GMT
• Title: Spin dynamics in quantum dots on liquid helium
• Authors: M. I. Dykman, Ofek Asban, Qianfan Chen, Dafei Jin, and S. A. Lyon
• Abstract summary: We consider the spin states of electrons electrostatically localized in quantum dots on a helium surface. Efficient gate operations in this system require spin-orbit coupling.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Liquid He-4 is free from magnetic defects, making it an ideal substrate for electrons with long-lived spin states. Such states can serve as qubit states. Here we consider the spin states of electrons electrostatically localized in quantum dots on a helium surface. Efficient gate operations in this system require spin-orbit coupling. It can be created by a nonuniform magnetic field from a current-carrying wire, can be turned on and off, and allows one to obtain large electro-dipole moment and comparatively fast coupling of spins in neighboring dots. Of central importance is to understand the spin decay due to the spin-orbit coupling. We establish the leading mechanism of such decay and show that the decay is sufficiently slow to enable high-fidelity single- and two-qubit gate operations

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