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Related Experiment Video

Updated: Jun 24, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Cavity mode emission in weakly coupled quantum dot--cavity systems.

T Tawara¹, H Kamada, S Hughes

¹NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198, Japan. tawara@nttbrl.jp

|April 15, 2009

Summary

Bright leaky-cavity emission in quantum dot systems originates from deep-level defects. Enhancing cavity-exciton coupling improves non-classical photon statistics, moving beyond classical behavior.

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Area of Science:

Quantum optics
Solid-state physics
Materials science

Background:

Semiconductor cavities and quantum dots are crucial for quantum information processing.
Understanding emission properties is key to controlling quantum phenomena.
Leaky-cavity modes and deep-level defects can influence system performance.

Purpose of the Study:

Investigate the source of bright leaky-cavity mode emission.
Analyze the impact of this emission on photon statistics.
Explore cavity-exciton coupling effects on non-classical light generation.

Main Methods:

Experimental measurements of quantum dot-semiconductor cavity systems.
Excitation above barrier energy to probe defect-related emission.
Second-order photon autocorrelation to measure photon statistics.
Utilizing a medium-dependent master equation model for theoretical analysis.

Main Results:

Bright leaky-cavity emission, especially at non-zero detuning, is dominated by deep-level defects under high excitation.
Cavity mode emission at non-zero detuning shows classical photon statistics.
Bare exciton emission exhibits partial anti-bunching.
Increased cavity-exciton coupling (Purcell factor enhancement) reduces defect contribution, enhancing non-classical anti-bunching.

Conclusions:

Deep-level defects significantly contribute to leaky-cavity emission in quantum dot systems.
Cavity-exciton coupling is essential for achieving non-classical photon statistics.
Controlling defect recombination and enhancing coupling are vital for advanced quantum applications.