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

Titelangaben

Cosacchi, Michael ; Seidelmann, Tim ; Cygorek, Moritz ; Vagov, Alexei ; Reiter, D. E. ; Axt, Vollrath Martin:
Accuracy of the Quantum Regression Theorem for Photon Emission from a Quantum Dot.
In: Physical Review Letters. Bd. 127 (2021) Heft 10 . - 100402.
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.127.100402

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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.