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Proceedings Paper

Quantum dot single photon sources with ultra-low multi-photon error rate (Conference Presentation)
Author(s): Lukas Hanschke; Kevin A. Fischer; Stefan Appel; Daniil Lukin; Jelena Vuckovic; Jonathan J. Finley; Kai Müller
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Paper Abstract

High-quality sources of single photons are of paramount importance for quantum communication, sensing and metrology. To these ends, resonantly excited two-level systems have recently generated widespread interest. Nevertheless, 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 [1]. Here, we investigate a two-photon excitation scheme based on a three-level system formed by the bi-exciton - exciton cascade in a self-assembled quantum dot and demonstrate that it improves the multi-photon error rate by several orders of magnitude [2]. We support our experiments with a new theoretical framework and simulation methodology to understand few-photon sources. For a resonantly excited two-level system the multi-photon error rate scales linear with the pulse length [3]. In contrast, the two-photon excitation scheme exhibits a quadratic dependence, improving the obtainable multi-photon error rate by several orders of magnitude for short pulses. Moreover, the scheme is easy to implement and facilitates fast repetition rates in contrast to schemes involving three-level lambda-type systems that require re-pumping. Unlike resonant excitation of a two-level system, this scheme does not require the measurement technique of cross-polarized suppression to reject the excitation laser and, thus, enables a higher source brightness. Finally, the scheme is directly compatible with increasing the emission rate by Purcell enhancement. [1] K.A. Fischer et al. Nature Physics 13, 649-654 (2017) [2] L. Hanschke, et al. arXiv:1801.01672 (2018) [3] K.A. Fischer, et al. Quantum Science and Technology 3, 1 (2017)

Paper Details

Date Published: 18 September 2018
Proc. SPIE 10734, Quantum Nanophotonics 2018, 107340B (18 September 2018); doi: 10.1117/12.2321389
Show Author Affiliations
Lukas Hanschke, Walter Schottky Institut (Germany)
Kevin A. Fischer, Stanford Univ. (United States)
Stefan Appel, Walter Schottky Institut (Germany)
Daniil Lukin, Stanford Univ. (United States)
Jelena Vuckovic, Stanford Univ. (United States)
Jonathan J. Finley, Walter Schottky Institut (Germany)
Kai Müller, Walter Schottky Institut (Germany)

Published in SPIE Proceedings Vol. 10734:
Quantum Nanophotonics 2018
Jennifer A. Dionne; Mark Lawrence; Matthew T. Sheldon, Editor(s)

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