Few-electron quantum dot circuit with integrated charge read out

2002/12/19 by J. M. Elzerman, Ronald Hanson, R. Hanson +9 · 17 citations
Computer Science · Physics and Astronomy · #Charge (physics) #Condensed matter physics #Diode #Electron #Heterojunction #Optoelectronics #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum dot #Quantum dot laser #Quantum mechanics #Quantum point contact #Quantum well #Qubit #Realization (probability) #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.67.161308

published as Phys. Rev. B 67, 161308(R) (2003) · 4 pages, 4 figures, submitted to Phys. Rev. Lett

arxiv created 2002/12/19 · openalex publication_date 2003/04/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We report on the realization of a few-electron double quantum dot defined in a two-dimensional electron gas by means of surface gates on top of a GaAs/AlGaAs heterostructure. Two quantum point contacts are placed in the vicinity of the double quantum dot and serve as charge detectors. These enable determination of the number of conduction electrons on each dot. This number can be reduced to zero, while still allowing transport measurements through the double dot. Microwave radiation is used to pump an electron from one dot to the other by absorption of a single photon. The experiments demonstrate that this quantum dot circuit can serve as a good starting point for a scalable spin-qubit system.

Citations

• Epitaxially Self-Assembled Quantum Dots
• Addition spectrum of a lateral dot from Coulomb and spin-blockade spectroscopy

Cited by

• Fano Effect in a Few-Electron Quantum Dot
• Polarization of a Charge Qubit Strongly Coupled to a Voltage-Driven Quantum Point Contact
• Production of multipartite entanglement for electron spins in quantum dots
• Single photoelectron detection after selective excitation of electron heavy-hole and electron light-hole pairs in double quantum dots
• Measurement Back-Action in Stacked Graphene Quantum Dots
• Quantum entanglement of space domains occupied by interacting electrons
• Enhancement-mode double-top-gated metal-oxide-semiconductor nanostructures with tunable lateral geometry
• A Ge/Si heterostructure nanowire-based double quantum dot with integrated charge sensor
• Tunneling without tunneling: wavefunction reduction in a mesoscopic qubit
• Nonequilibrium stabilization of charge states in double quantum dots
• Spins in few-electron quantum dots
• Superconductor–semiconductor hybrid-circuit quantum electrodynamics
• Wave function engineering in quantum dot–ring nanostructures
• Noninvasive detection of charge rearrangement in a quantum dot in high magnetic fields
• Discrete charging of traps visualized by scanning gate experiments on a quantum point contact
• Effect of confinement potential shape on exchange interaction in coupled quantum dots
• Driven coherent oscillations of a single electron spin in a quantum dot