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Related Experiment Video

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: June 8, 2018

Optical signatures of coupled quantum dots.

E A Stinaff¹, M Scheibner, A S Bracker

¹Naval Research Laboratory, Washington, DC 20375, USA.

Science (New York, N.Y.)

|January 18, 2006

Summary

Researchers achieved optical coupling of coupled indium arsenide (InAs) quantum dots using electric fields. This enables coherent molecular wave functions for quantum information processing applications.

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Area of Science:

Quantum physics
Condensed matter physics
Materials science

Background:

Coupled quantum dots are promising for quantum information processing.
Controlling quantum states in coupled systems is challenging.

Purpose of the Study:

To demonstrate optical coupling of asymmetric InAs quantum dots.
To investigate the formation of coherent molecular wave functions.
To explore applications in quantum information processing.

Main Methods:

Tuning coupled InAs quantum dots into resonance using an electric field.
Analyzing optical spectra for level anticrossings and crossings.
Investigating the role of Coulomb interactions and charge/spin configurations.

Main Results:

A single hole formed a coherent molecular wave function in the coupled quantum dots.
Optical spectra revealed complex level dynamics indicative of charge and spin superposition.
Coulomb interactions were shown to shift the molecular resonance, enabling light-induced coupling.

Conclusions:

Optically coupling quantum dots is feasible.
The demonstrated control over coupled quantum dot states is crucial for quantum information processing.
This work paves the way for novel quantum technologies.