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Optical nonlinearity for few-photon pulses on a quantum dot-pillar cavity device
1Laboratoire de Photonique et Nanostructures, LPN/CNRS, Route de Nozay, 91460 Marcoussis, France.
Physical Review Letters
|December 11, 2012
Summary
Giant optical nonlinearity was achieved in a quantum dot-micropillar system. This breakthrough enables single-photon interactions with a record low threshold of 8 photons per pulse.
Area of Science:
- Quantum optics
- Solid-state physics
- Nanophotonics
Background:
- Giant optical nonlinearity is crucial for quantum information processing.
- Strong coupling in quantum dot-micropillar systems is a promising platform for nonlinear optics.
Purpose of the Study:
- To investigate giant optical nonlinearity in a deterministically coupled quantum dot-micropillar system.
- To determine the critical intracavity photon number and coupling efficiencies.
- To achieve a record low nonlinearity threshold for practical applications.
Main Methods:
- Utilized absolute reflectivity measurements.
- Employed both continuous wave and pulsed excitation.
- Characterized a deterministically coupled quantum dot-micropillar system in the strong-coupling regime.
Main Results:
- Observed giant optical nonlinearity under both continuous wave and pulsed excitation.
- Achieved a record nonlinearity threshold of 8 incident photons per pulse due to near-unity input-coupling efficiency.
- Demonstrated that output-coupling efficiency significantly influences the nonlinearity threshold.
Conclusions:
- The study demonstrates the potential for attaining single-photon nonlinearity in realistic devices.
- This advancement paves the way for effective interactions between single photons.
- The findings are significant for developing advanced quantum technologies.
