Accuracy of the quantum regression theorem for photon emission from a quantum dot

• URL: http://arxiv.org/abs/2103.13100v3
• Date: Fri, 17 Dec 2021 13:23:20 GMT
• Title: Accuracy of the quantum regression theorem for photon emission from a quantum dot
• Authors: M. Cosacchi, T. Seidelmann, M. Cygorek, A. Vagov, D. E. Reiter, V. M. Axt
• Abstract summary: 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 quantum regression theorem. 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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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 the environmental coupling. In this work 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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