Single-Electron Qubits Based on Quantum Ring States on Solid Neon Surface.

Area of Science:

• Quantum Computing
• Surface Science
• Condensed Matter Physics

Background:

• Single electrons on solid neon are a promising platform for charge qubits.
• Experimental data show long coherence times, but quantum states are not fully understood.
• Neon surfaces are imperfectly flat, influencing trapped electron behavior.

Purpose of the Study:

• To investigate the quantum states of electrons trapped on solid neon surfaces.
• To understand the role of surface topography in electron binding and quantum state formation.
• To explore magnetic field tuning for qubit operations.

Main Methods:

• Evaluating induced surface charges to determine electron binding.
• Solving the Schrödinger equation for lateral electron motion on curved surfaces.
• Analyzing the effects of topographical variations like bumps and valleys.

Main Results:

• Demonstrated strong perpendicular binding of electrons to the neon surface.
• Identified that surface bumps can form unique quantum ring states for trapped electrons.
• Showed that electron excitation energy is tunable with a magnetic field.

Conclusions:

• Surface topography significantly influences electron quantum states on solid neon.
• Quantum ring states provide a model consistent with experimental observations.
• Findings offer strategies for reducing charge noise and scaling electron-on-neon qubits for quantum computing.