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Evolution of Staircase Structures in Diffusive Convection

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Published on: September 5, 2018

Steady-state coherent transfer by adiabatic passage.

Jan Huneke¹, Gloria Platero, Sigmund Kohler

¹Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, Spain.

Physical Review Letters

|February 5, 2013

Summary

We demonstrate a new method for controlling electron transport in quantum dots using coherent transfer by adiabatic passage (CTAP). This technique enables efficient single-electron transfer between distant quantum dots, significantly suppressing shot noise and offering experimental evidence for nonoccupation of intermediate dots.

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Area of Science:

Quantum physics
Condensed matter physics
Nanotechnology

Background:

Electron transport in quantum dots is crucial for quantum computing.
Controlling single-electron movement is experimentally challenging.
Coherent transfer by adiabatic passage (CTAP) offers a potential control mechanism.

Purpose of the Study:

To propose and analyze a novel method for steady-state electron transport in a triple quantum dot system.
To demonstrate the steering of single electrons between spatially separated quantum dots using CTAP.
To investigate the suppression of shot noise as an indicator of efficient electron transfer.

Main Methods:

Theoretical modeling of electron transport in a linearly arranged triple quantum dot.
Application of the coherent transfer by adiabatic passage (CTAP) protocol.
Analysis of steady-state current and shot noise properties.

Main Results:

Achieved repeated steering of single electrons from the first to the last quantum dot.
Demonstrated significant suppression of shot noise when the CTAP protocol is effective.
Observed minimal occupation of the middle quantum dot during electron transfer.

Conclusions:

CTAP provides a viable method for controlled single-electron transport in quantum dots.
Shot noise suppression serves as a key experimental signature for direct electron transfer.
This approach may help resolve challenges in experimentally verifying nonoccupation of intermediate quantum dots.