Related Experiment Video
Updated: Oct 19, 2025

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Accuracy of the Quantum Regression Theorem for Photon Emission from a Quantum Dot
M Cosacchi1, T Seidelmann1, M Cygorek2
1Theoretische Physik III, Universität Bayreuth, 95440 Bayreuth, Germany.
Abstract:
The quantum regression theorem (QRT) is the most widely used tool for calculating multitime correlation functions for the assessment of quantum emitters. It is an approximate method based on a Markov assumption for environmental coupling. In this Letter we quantify properties of photons emitted from a single quantum dot coupled to phonons. For the single-photon purity and the indistinguishability, we compare numerically exact path-integral results with those obtained from the QRT. It is demonstrated that the QRT systematically overestimates the influence of the environment for typical quantum dots used in quantum information technology.
Related Concept Videos
The Quantum-Mechanical Model of an Atom
The Bohr Model
The de Broglie Wavelength
Photoelectric Effect
The Uncertainty Principle
Emission Spectra

