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Related Experiment Video

Updated: Jun 12, 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

Quantum interference of electrically generated single photons from a quantum dot.

Raj B Patel¹, Anthony J Bennett, Ken Cooper

¹Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Cambridge Science Park, Milton Road, Cambridge CB4 0GZ, UK.

|June 24, 2010

Summary

This summary is machine-generated.

Researchers developed an electrically driven single-photon source using InAs quantum dots. This device emits indistinguishable photons, crucial for quantum computing and communication, achieving high visibility in interference experiments.

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Area of Science:

Quantum Optics
Solid-State Physics
Quantum Information Science

Background:

Quantum interference is fundamental for quantum computing and communication.
Indistinguishable photons are required to observe quantum interference.
Electrical control over single-photon emission is technologically desirable.

Purpose of the Study:

To demonstrate an electrically driven single-photon source emitting indistinguishable photons.
To test the indistinguishability of photons under different operational modes.
To develop and validate a theoretical model for photon interference.

Main Methods:

Fabrication of a p-i-n diode with embedded InAs quantum dots.
Two-photon interference experiments using continuous and pulsed current injection.
Comparison of experimental results with a theoretical model based on Lorentzian spectra.

Main Results:

High visibility of photon indistinguishability achieved, limited by detection timing resolution in continuous mode.
Pulsed current injection with a two-pulse voltage sequence suppressed multi-photon emission.
Measured Hong-Ou-Mandel dip with 64 +/- 4% visibility in pulsed mode, demonstrating photon indistinguishability.

Conclusions:

An electrically driven single-photon source capable of emitting indistinguishable photons has been successfully realized.
The device shows promise for scalable quantum information processing.
The theoretical model accurately describes the observed interference phenomena.