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Related Experiment Video

Updated: May 1, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Coherent control to prepare an InAs quantum dot for spin-photon entanglement.

L A Webster¹, K Truex¹, L-M Duan¹

¹The H. M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA.

Physical Review Letters

|April 15, 2014

Summary

This summary is machine-generated.

Researchers created a spin-photon entanglement precursor in quantum dots using precise optical pulses. This method enables coherent control for future quantum information processing applications.

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Area of Science:

Quantum Information Science
Solid-State Physics
Optoelectronics

Background:

Deterministic entanglement of electron spins with photons is crucial for quantum computing.
Single self-assembled quantum dots offer a promising platform for generating entangled photon-electron spin states.

Purpose of the Study:

To optically generate a precursor state for deterministic spin-photon entanglement in a single InAs/GaAs quantum dot.
To implement a coherent control technique for manipulating quantum states.

Main Methods:

Optical pumping to prepare a superposition state.
Using a two-pulse coherent control sequence with precisely timed broadband pulses.
Employing interferometric measurement of path length differences for control.

Main Results:

Successfully generated a "preentangled" electronic state in a single quantum dot.
Demonstrated selective driving of superposition components using spin-dependent optical transitions.
Measured the coherence of the prepared state.

Conclusions:

The developed optical technique is a key step towards deterministic spin-photon entanglement.
Coherent control over quantum dot states is achievable with precise pulse timing.
This work advances the development of quantum information processing technologies.