Validity of the single-particle description and charge noise resilience for multielectron quantum dots

Abstract

We construct an optimal set of single-particle states for few-electron quantum dots (QDs) using the method of natural orbitals (NOs). The NOs include also the effects of the Coulomb repulsion between electrons. We find that they agree well with the noniteracting orbitals for GaAs QDs of realistic parameters, while the Coulomb interactions only rescale the radius of the NOs compared to the noninteracting case. We use NOs to show that four-electron QDs are less susceptible to charge noise than their two-electron counterparts.

arXiv comment11+ pages, 5 figures

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• Wigner molecules and hybrid qubits
• Leakage and sweet spots in triple-quantum-dot spin qubits: A molecular-orbital study
• High-precision real-space simulation of electrostatically-confined few-electron states
• Charge-noise resilience of two-electron quantum dots in Si/SiGe heterostructures
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• Theory on electron-phonon spin dehphasing in GaAs multi-electron double quantum dots
• On the validity of microscopic calculations of double-quantum-dot spin qubits based on Fock-Darwin states
• Exploring Entanglement Spectrum and Phase Diagram in multi-electron Quantum Dot Chains