Few-electron quantum dots for quantum computing

Abstract

Two tunnel-coupled few-electron quantum dots were fabricated in a GaAs/AlGaAs quantum well. The absolute number of electrons in each dot could be determined from finite bias Coulomb blockade measurements and gate voltage scans of the dots, and allows the number of electrons to be controlled down to zero. The Zeeman energy of several electronic states in one of the dots was measured with an in-plane magnetic field, and the g-factor of the states was found to be no different than that of electrons in bulk GaAs. Tunnel-coupling between dots is demonstrated, and the tunneling strength was estimated from the peak splitting of the Coulomb blockade peaks of the double dot.

11 pages, 5 figures. Website at http://meso.deas.harvard.edu

References in corpus (10)

• Quantum Computation with Quantum Dots
• Polynomial-Time Algorithms for Prime Factorization and Discrete Logarithms on a Quantum Computer
• Quantum Mechanics helps in searching for a needle in a haystack
• Experimental realization of Shor's quantum factoring algorithm using nuclear magnetic resonance
• Two-Bit Gates are Universal for Quantum Computation
• Experimental realization of a quantum algorithm
• Few-Electron Quantum Dot Circuit with Integrated Charge Read-Out
• Spin and Polarized Current from Coulomb Blockaded Quantum Dots
• Relation between Barrier Conductance and Coulomb Blockade Peak Splitting for Tunnel-Coupled Quantum Dots
• Higher-Order Results for the Relation between Channel Conductance and the Coulomb Blockade for Two Tunnel-Coupled Quantum Dots

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• Charge Sensing of an Artificial H2+ Molecule
• Phase Evolution in Spatial Dark States
• Artificial quantum-dot Helium molecules: Electronic spectra, spin structures, and Heisenberg clusters
• Charge trapping in the system of interacting quantum dots
• Oscillating properties of a two-electron quantum dot in the presence of a magnetic field
• 3D two-electron double quantum dot: comparison between the behavior of some physical quantities under two different confinement potentials in the presence of a magnetic field
• Informational analysis of the confinement of an electron in an asymmetric double quantum dot
• Time evolution of an entangled initial state in coupled quantum dots with Coulomb correlations