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Related Experiment Video

Updated: Jul 14, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Published on: January 19, 2018

Single-electron delocalization in hybrid vertical-lateral double quantum dots.

T Hatano¹, M Stopa, S Tarucha

¹Quantum Spin Information Project, International Cooperative Research Project, Japan Science and Technology Agency, Morinosato Wakamiya 3-1, Atsugi-shi, Kanagawa, 243-0198, Japan.

Science (New York, N.Y.)

|July 9, 2005

Summary

Researchers tuned interdot tunnel coupling in a novel quantum dot device. This control enables the creation of specific electron states, paving the way for two-electron spin entanglement applications.

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Area of Science:

Quantum physics
Condensed matter physics
Nanotechnology

Background:

Quantum dots are semiconductor nanocrystals with tunable electronic properties.
Understanding interdot coupling is crucial for quantum information processing.
Previous methods for measuring tunnel coupling in double-dot systems have limitations.

Purpose of the Study:

To develop a novel hybrid vertical-lateral double-dot device.
To accurately measure and tune interdot tunnel coupling.
To prepare and characterize specific multi-electron quantum states.

Main Methods:

Utilized nonlinear transport measurements on a hybrid vertical-lateral double-dot device.
Analyzed Coulomb diamond features to determine electron pathways.
Employed capacitance asymmetry to distinguish electron passage through individual dots.

Main Results:

Successfully measured interdot tunnel coupling in the device.
Demonstrated tunability of the interdot tunnel coupling.
Prepared a delocalized one-electron state and a Heitler-London (HL) two-electron state.
Showed that HL state's ground state nature depends on tunable coupling.

Conclusions:

The developed device allows for precise measurement and tuning of interdot tunnel coupling.
The ability to control coupling and prepare specific states is promising for quantum computing.
The device shows potential for implementing two-electron spin entanglement.