NDLI: Efficient Pulse-Excitation Techniques for Single Photon Sources from Quantum Dots in Cavities

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Efficient Pulse-Excitation Techniques for Single Photon Sources from Quantum Dots in Cavities

Content Provider	Semantic Scholar
Author	Gustin, Chris Hughes, Stephen
Copyright Year	2019
Abstract	We present rigorous and intuitive master equation models to study on-demand single photon sources from pulse-excited quantum dots coupled to cavities. We consider three methods of source excitation: resonant pi-pulse, off-resonant phonon-assisted inversion, and two-photon excitation of a biexciton-exciton cascade, and investigate the effect of the pulse excitation process on the quantum indistinguishability, efficiency, and purity of emitted photons. By explicitly modelling the time-dependent pulsed excitation process in a manner which captures non-Markovian effects associated with coupling to photon and phonon reservoirs, we find that photons of near-unity indistinguishability can be emitted with over 90% efficiency for all these schemes, with the off-resonant schemes not necessarily requiring polarization filtering due to the frequency separation of the excitation pulse, and allowing for very high single photon purities. Furthermore, the off-resonant methods are shown to be robust over certain parameter regimes, with less stringent requirements on the excitation pulse duration in particular. We also derive a semi-analytical simplification of our master equation for the off-resonant drive, which gives insight into the important role that exciton-phonon decoupling for a strong drive plays in the off-resonant phonon-assisted inversion process
File Format	PDF HTM / HTML
DOI	10.1002/qute.201900073
Alternate Webpage(s)	http://arxiv-export-lb.library.cornell.edu/pdf/1906.06447
Alternate Webpage(s)	https://arxiv.org/pdf/1906.06447v2.pdf
Alternate Webpage(s)	https://doi.org/10.1002/qute.201900073
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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