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Updated: May 12, 2026
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Deterministic photon pairs and coherent optical control of a single quantum dot
Harishankar Jayakumar1, Ana Predojević, Tobias Huber
1Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria. harishankar@uibk.ac.at
Physical Review Letters
|April 16, 2013
Summary
Researchers developed a clean single photon source using InAs/GaAs quantum dots and two-photon excitation. This method enables precise control and extended coherence for quantum information applications.
Area of Science:
- Quantum Optics
- Semiconductor Nanostructures
Background:
- Semiconductor quantum dots exhibit atomlike behavior due to strong exciton confinement.
- Resonant excitation allows deterministic population and coherent manipulation of quantum dot states.
- Observing clean, resonantly excited emission from III/V quantum dots is challenging due to laser scattering.
Purpose of the Study:
- To create an extremely clean single photon source from InAs/GaAs quantum dots.
- To demonstrate complete suppression of excitation laser and multiphoton emissions.
- To achieve full coherent control of a ground-biexciton state qubit.
Main Methods:
- Exploiting the biexciton binding energy in InAs/GaAs quantum dots.
- Utilizing two-photon resonant excitation.
- Employing an all-optical echo technique for coherence time measurement.
Main Results:
- Achieved complete suppression of the excitation laser and multiphoton emissions.
- Demonstrated full coherent control of the ground-biexciton state qubit.
- Observed an extended coherence time using the all-optical echo technique.
Conclusions:
- Deterministic coherent photon pair creation is possible in this system.
- The developed source is suitable for generating time-bin entanglement.
- The system facilitates experiments on photon interactions from dissimilar sources.
