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

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Published on: October 13, 2017

Spontaneous two-photon emission from a single quantum dot.

Yasutomo Ota¹, Satoshi Iwamoto, Naoto Kumagai

¹Institute for Nano Quantum Information Electronics, The University of Tokyo, 4-6-1 Komaba, Tokyo 153-8505, Japan. ota@iis.u-tokyo.ac.jp

Physical Review Letters

|December 21, 2011

Summary

This summary is machine-generated.

Researchers observed spontaneous two-photon emission from a single quantum dot. This quantum phenomenon, enhanced by a photonic crystal nanocavity, shows potential for advanced light-based technologies.

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Published on: June 28, 2016

Area of Science:

Quantum Optics
Solid-State Physics
Nanophotonics

Background:

Quantum emitters, such as semiconductor quantum dots, are fundamental for quantum information processing.
Controlling photon emission pathways is crucial for developing efficient quantum light sources.
Photonic crystal nanocavities offer enhanced light-matter interaction for manipulating quantum emitters.

Purpose of the Study:

To investigate spontaneous two-photon emission from a neutral biexciton in a quantum dot.
To explore the role of a high-Q photonic crystal nanocavity in enhancing biexciton emission.
To understand the conditions favoring simultaneous two-photon emission over single-photon emission.

Main Methods:

Utilized photoluminescence spectroscopy to study a single semiconductor quantum dot coupled to a photonic crystal nanocavity.
Tuned the nanocavity resonance to match half the biexciton energy.
Analyzed emission spectra to observe and quantify two-photon emission and single-photon suppression.

Main Results:

Observed clear enhancement of emission into the nanocavity mode due to simultaneous two-photon emission from the biexciton.
Demonstrated that the strong vacuum field within the resonant cavity stimulates this two-photon emission.
Noted suppression of other single-photon emission pathways from the biexciton at resonance, indicating a faster two-photon process.

Conclusions:

Spontaneous two-photon emission from a solid-state single quantum emitter is achievable and controllable.
Coupling quantum dots with high-Q nanocavities provides a pathway to enhance and control biexciton emission.
This controlled two-photon emission has implications for developing novel quantum light sources and photonic devices.