Accuracy of the Quantum Regression Theorem for Photon Emission from a Quantum Dot

M. Cosacchi, T. Seidelmann, M. Cygorek, A. Vagov, D. E. Reiter, V. M. Axt

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number100402
JournalPhysical Review Letters
Volume127
Issue number10
DOIs
Publication statusPublished - 3 Sep 2021

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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