Highly Tunable Hybrid Quantum Dots with Charge Detection

Abstract

In order to employ solid state quantum dots as qubits, both a high degree of control over the confinement potential as well as sensitive charge detection are essential. We demonstrate that by combining local anodic oxidation with local Schottky-gates, these criteria are nicely fulfilled in the resulting hybrid device. To this end, a quantum dot with adjacent charge detector is defined. After tuning the quantum dot to contain only a single electron, we are able to observe the charge detector signal of the quantum dot state for a wide range of tunnel couplings.

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Cited by in corpus (6)

• Irreversibility on the Level of Single-Electron Tunneling
• Trapping and counting ballistic non-equilibrium electrons
• Ultra-shallow quantum dots in an undoped GaAs/AlGaAs 2D electron gas
• Tunable Charge Detectors for Semiconductor Quantum Circuits
• Periodic negative differential conductance in a single metallic nano-cage
• Quantum dot occupation and electron dwell time in the cotunneling regime