Tuning spatial entanglement in interacting few-electron quantum dots

Abstract

Confined geometries such as semiconductor quantum dots are promising candidates for fabricating quantum computing devices. When several quantum dots are in proximity, spatial correlation between electrons in the system becomes significant. In this article, we develop a fully variational action integral formulation for calculating accurate few-electron wavefunctions in configuration space, irrespective of potential geometry. To evaluate the Coulomb integrals with high accuracy, a novel numerical integration method using multiple Gauss quadratures is proposed. Using this approach, we investigate the confinement of two electrons in double quantum dots, and evaluate the spatial entanglement. We investigate the dependence of spatial entanglement on various geometrical parameters. We derive the two-particle wavefunctions in the asymptotic limit of the separation distance between quantum dots, and obtain universal saturation values for the spatial entanglement. Resonances in the entanglement values due to avoided level-crossings of states are observed. We also demonstrate the formation of electron clusters, and show that the entanglement value is a good indicator for the formation of such clusters. Further, we show that a precise tuning of the entanglement values is feasible with applied external electric fields.

References in corpus (46)

• Quantum Computation with Quantum Dots
• Coupled quantum dots as quantum gates
• Coherent manipulation of electronic states in a double quantum dot
• A programmable two-qubit quantum processor in silicon
• Spin-orbit qubit in a semiconductor nanowire
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Quantum Entanglement in Fermionic Lattices
• Quantum Correlations in Systems of Indistinguishable Particles
• Quantum Correlations in Two-Fermion Systems
• Single quantum dot nanowire LEDs
• The entanglement of indistinguishable particles shared between two parties
• Hilbert space structure of a solid state quantum computer: two-electron states of a double quantum dot artificial molecule
• A subsystem-independent generalization of entanglement
• General criterion for the entanglement of two indistinguishable particles
• Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
• Spectroscopy of spin-orbit quantum bits in indium antimonide nanowires
• Double-Occupancy Errors, Adiabaticity, and Entanglement of Spin-Qubits in Quantum Dots
• Layered architecture for quantum computing
• Extracting entanglement from identical particles
• Indistinguishability of elementary systems as resource for quantum information processing
• A Full Configuration Interaction Perspective on the Homogeneous Electron Gas
• Gate-controlled quantum dots and superconductivity in planar germanium
• Linear entropy as an entanglement measure in two-fermion systems
• Topological quantum buses: coherent quantum information transfer between topological and conventional qubits
• Coulombically Interacting Electrons in a One-dimensional Quantum Dot
• Entanglement and density-functional theory: testing approximations on Hooke's atom
• Fast coherent manipulation of three-electron states in a double quantum dot
• Separability Criteria and Entanglement Measures for Pure States of N Identical Fermions
• Benchmarks of the full configuration interaction, Monte Carlo shell model, and no-core full configuration methods
• Joint remote state preparation (JRSP) of two-qubit equatorial state in quantum noisy channels
• Engineering inter-qubit exchange coupling between donor bound electrons in silicon
• Quantum dephasing in a gated GaAs triple quantum dot due to nonergodic noise
• Ensemble averaged entanglement of two-particle states in Fock space
• Exchange Symmetry and Multipartite Entanglement
• Teleportation on a quantum dot array
• QCAD Simulation and Optimization of Semiconductor Quantum Dots
• Effect of confinement potential geometry on entanglement in quantum dot-based nanostructures
• Deterministic teleportation of electrons in a quantum dot nanostructure
• Two-electron states of a group V donor in silicon from atomistic full configuration interaction
• Quantum teleportation of electrons in quantum wires with surface acoustic waves
• Configuration interaction calculations of the controlled phase gate in double quantum dot qubits
• A double quantum dot memristor
• Real Space Hartree-Fock Configuration Interaction Method For Complex Lateral Quantum Dot Molecules
• Magnetic alteration of entanglement in two-electron quantum dots
• The Different Effect of Electron-Electron Interaction on the Spectrum of Atoms and Quantum Dots
• A configuration interaction analysis of exchange in double quantum dots

Cited by in corpus (4)

• Spatial entanglement of fermions in one-dimensional quantum dots
• Random spin-orbit gates in the system of a Topological insulator and a Quantum dot
• Biphoton phase-space correlations from Gouy-phase measurements using double slits
• Exploring Entanglement Spectrum and Phase Diagram in multi-electron Quantum Dot Chains