Quantum dot single photon sources with ultra-low multi-photon probability

High-quality sources of single photons are of paramount importance for quantum communication, sensing and metrology. To these ends, resonantly excited two-level systems based on self-assembled quantum dots have recently generated widespread interest. Nevertheless, we have recently shown that for res...

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Bibliographic Details
Published in:arXiv.org 2018-09
Main Authors: Hanschke, Lukas, Fischer, Kevin A, Appel, Stefan, Lukin, Daniil, Wierzbowski, Jakob, Sun, Shuo, Trivedi, Rahul, Vučković, Jelena, Finley, Jonathan J, Müller, Kai
Format: Article
Language:English
Subjects:
Dependence
Excitation
Photons
Quantum dots
Quantum theory
Self-assembly
Short pulses
Online Access:Get full text
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Summary:High-quality sources of single photons are of paramount importance for quantum communication, sensing and metrology. To these ends, resonantly excited two-level systems based on self-assembled quantum dots have recently generated widespread interest. Nevertheless, we have recently shown that for resonantly excited two-level systems, emission of a photon during the presence of the excitation laser pulse and subsequent re-excitation results in a degradation of the obtainable single-photon purity. Here, we demonstrate that generating single photons from self-assembled quantum dots with a scheme based on two-photon excitation of the biexciton strongly suppresses the re-excitation. Specifically, the pulse-length dependence of the multi-photon error rate reveals a quadratic dependence in contrast to the linear dependence of resonantly excited two-level systems, improving the obtainable multi-photon error rate by several orders of magnitude for short pulses. We support our experiments with a new theoretical framework and simulation methodology to understand few-photon sources.
ISSN:2331-8422
DOI:10.48550/arxiv.1801.01672