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Updated: Mar 20, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Fast spin information transfer between distant quantum dots using individual electrons.

B Bertrand^1,2, S Hermelin^1,2, S Takada^1,2,3

¹Université Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France.

Nature Nanotechnology

|May 31, 2016

Summary

This summary is machine-generated.

Spin information from single electrons can now be transferred between quantum dots 4 micrometers apart. This breakthrough in electron spin transport is crucial for developing future quantum spintronics and quantum information processing technologies.

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Area of Science:

Quantum physics
Condensed matter physics
Spintronics

Background:

Transporting spin-polarized electrons over distances is key for spintronic devices.
Controlling nanocircuits at the single-electron level is advancing rapidly.
Spin detection and manipulation in quantum dots are established techniques.

Purpose of the Study:

To demonstrate the transfer of spin information carried by single electrons between distant quantum dots.
To assess the fidelity of spin information transfer over microscale distances.
To identify limitations in current spin transfer protocols.

Main Methods:

Utilizing quantum dots separated by 4 micrometers.
Employing controlled displacement of individual electrons between dots.
Measuring the fidelity of spin information transfer.

Main Results:

Successfully transferred spin information of one or two electrons between quantum dots 4 micrometers apart.
Achieved a classical fidelity of 65% for the spin transfer.
Identified spin flips during electron displacement as the primary limitation.

Conclusions:

Spin information transfer over microscale distances is feasible, albeit with current fidelity limits.
Addressing spin flips during electron transfer is essential for improving fidelity.
This work is a significant step towards quantum spintronics and large-scale quantum information processing.