Experiments And Simulations On A Few‐Electron Quantum Dot Circuit With Integrated Charge Read‐Out

By Ronald Hanson, J. Elzerman, L. V. Beveren, Lieven M. K. Vandersypen, L.-X. Zhang, Philippe Matagne, J. Leburton, L. Kouwenhoven. 2002

319 citations recorded by the source corpus.

We report measurements and simulations on a fully tunable double quantum dot circuit, integrated with two quantum point contacts that serve as charge detectors. The circuit is defined in a two‐dimensional electron gas by means of surface gates on top of a GaAs/AlGaAs heterostructure. Full control over the electron number (down to zero), the dot‐lead coupling and the inter‐dot tunnel coupling is experimentally demonstrated. Computer simulations can map out the double dot charging diagram and show that the charge sensitivity can be significantly enhanced by improving the design of the circuit.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/a1c3b6ed60e13c8336357e9f4233b6030055f044

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Single-shot read-out of an individual electron spin in a quantum dot (2004, methodology): “ twodimensional electron gas (2DEG) 90 nm below the surface. The electron density is 2.9 × 1015 m−2. (Only the gates used in the present experiment are shown, the complete device is described in Ref. [23].) Electrical contact is made to the QPC source and drain and to the reservoir via Ohmic contact”
Quantum error correction for quantum memories (2013, unknown): “Examples of weak continuous qubit measurements are the measurement of a spin qubit in a semiconducting quantum dot through a quantum point contact (Elzerman et al. , 2003) and the measurement of a superconducting transmon qubit through homodyne measurement of a microwave cavity field with which it…”
Single-electron current sources: towards a refined definition of ampere (2012, background): “Furthermore, quantum dots can contain a low number of electrons in the conduction band ranging from zero (Ashoori et al., 1993; Elzerman et al., 2003; Lim et al., 2009) to more than hundreds similar to natural atoms, whereas the corresponding number is orders of magnitude higher for metallic…”
Spins in few-electron quantum dots (2006, methodology): “This property can be exploited to determine the absolute number of electrons in single (Sprinzak et al., 2002) and coupled quantum dots (Elzerman et al., 2003), even when the tunnel coupling is so small that no current through the dot is detected.”