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

doi:10.1103/PhysRevLett.127.100402

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

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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.

Original language	English
Article number	100402
Journal	Physical Review Letters
Volume	127
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.127.100402
Publication status	Published - 3 Sept 2021

ASJC Scopus subject areas

General Physics and Astronomy

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© 2021 American Physical Society. Physical Review Letters 127, 100402 – Published 31 August 2021
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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.",

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

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