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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Wigner molecules and hybrid qubits.

Constantine Yannouleas1, Uzi Landman1

  • 1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 5, 2022
PubMed
Summary
This summary is machine-generated.

Exact diagonalization accurately predicts spectra for three-electron hybrid qubits. This method reveals Wigner molecules, crucial for understanding quantum dot behavior, unlike prior models.

Keywords:
Wigner moleculeconfiguration interactionhybrid qubitquantum-computer qubitthree-electron double quantum dot

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Area of Science:

  • Quantum Computing
  • Condensed Matter Physics
  • Materials Science

Background:

  • Hybrid qubits in quantum dots are promising for quantum computation.
  • Previous theoretical models failed to capture essential physics like electron correlations.

Purpose of the Study:

  • To develop and validate a theoretical model for predicting the spectra of three-electron hybrid qubits.
  • To investigate the role of electron correlations and Wigner molecules in hybrid qubit behavior.

Main Methods:

  • Utilizing exact diagonalization of the many-body Hamiltonian.
  • Employing systematic full configuration-interaction (FCI) calculations.
  • Analyzing spectroscopic patterns as a function of detuning.

Main Results:

  • FCI calculations accurately predict qubit spectra and avoided crossings.
  • Spectroscopic patterns are intrinsically linked to Wigner molecule formation.
  • Independent-particle and Hubbard models are insufficient for these systems.

Conclusions:

  • Full configuration-interaction is a robust method for modeling multi-electron quantum dot systems.
  • Wigner molecules play a critical role in the physics of hybrid qubits.
  • The FCI methodology is extendable to other systems like Si/SiGe qubits.