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Picosecond pulse shaping of single photons using quantum dots
B C Pursley1, S G Carter2, M K Yakes3
1NRC Research Associate residing at the Naval Research Laboratory, Washington, DC, 20375, USA.
Nature Communications
|January 11, 2018
Summary
Researchers demonstrate precise control over single-photon pulse shapes from quantum dots (QDs). This breakthrough enables faster, tunable photon generation for advanced quantum technologies and networks.
Area of Science:
- Quantum optics
- Solid-state physics
- Quantum information science
Background:
- Quantum dots (QDs) are vital single-photon sources for quantum technologies.
- Controlling photon characteristics is crucial for quantum applications.
- Raman photon generation from QDs offers tunable properties.
Purpose of the Study:
- To demonstrate precise control over the temporal and spectral properties of single Raman photons emitted by QDs.
- To achieve ultra-short single-photon pulse shaping on timescales faster than the exciton lifetime.
- To explore applications in quantum information processing and quantum networks.
Main Methods:
- Utilizing a Λ energy-level system, specifically the spin singlet-triplet system in coupled QDs.
- Employing a tunable excitation source to trigger coherent Raman photons.
- Characterizing the temporal and spectral profiles of the emitted single photons.
Main Results:
- Achieved control over single-photon pulse shape, frequency, and bandwidth.
- Demonstrated an 80 picosecond (ps) photon pulse width, significantly shorter than the exciton lifetime.
- Showcased the ability to tailor photon characteristics by modifying the excitation source.
Conclusions:
- This work provides a powerful method for controlling single-photon pulse shapes in solid-state systems.
- The demonstrated technique enables ultra-fast photon generation, crucial for advanced quantum applications.
- Potential applications include time-bin encoding, photon source matching, and efficient quantum network transfer.
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